The bakery table was the same one she had pressed her palms against three days ago when she accepted Sal's handshake. Same crack in the laminate running diagonally from one corner. Same flour dust collected in the grout lines of the tile floor. Different conversation.

  Isadora stood over it with both palms flat on the surface, leaning forward, weight on her arms. Between her hands lay a sheet of bakery paper she had commandeered from the counter, covered in her cramped academic hand. A rough diagram. The lakefront sidewalk rendered as a line, the Air ley line beneath it as a parallel line, and between them a third line, broken and uncertain, labeled in her own language with a word that translated approximately to *conducted resonance through foreign medium*.

  "I need to go beneath the streets."

  Sal sat across from her with his arms crossed, chair tipped back on two legs, the front edge of his loafers lifting off the tile. He adjusted his glasses, pushing them up the bridge of his nose with one finger, then pulling them back down. The bakery's fluorescent lights caught the grease smear on his left lens.

  "Beneath the streets." He said it flat. Not a question. A repetition, the way a man repeats the number on a restaurant bill to make sure he read it right.

  "The resonance I detected on the lakefront is conducted through your electrical infrastructure. The signal was too diffuse at street level. Too much interference from surface systems, foot traffic, the ambient vibration of your machines. I need proximity to the conduits. I need to determine whether what I felt was incidental leakage or a systematic interaction."

  "Look, Iz." He let the chair drop forward onto all four legs. "The tunnels under this city are not a guided tour. Pete's tunnels, the maintenance corridors, the CTA service shafts... those are working infrastructure. Electrical, water mains, transit lines. You don't just stroll down there with glowing hair clips and start doing wizard stuff next to a live trunk line."

  "The bones, Sal."

  She straightened. Pulled her hands off the table and clasped them in front of her, a posture she had used in academic councils when the argument was finished and the vote was a formality. She watched his face. The resistance was real. His eyes kept drifting to the diagram on the bakery paper, and she read it the way a court rival reads hesitation: the curiosity was winning. Sal's paranoia was discipline. His need to understand things was momentum, and momentum always won.

  He stared at the diagram for three more seconds. Then he reached into his jacket, pulled out the flip phone, and dialed without looking at the screen. The conversation lasted twenty seconds. Half-sentences that functioned as code.

  "Yeah. Tonight. The Jackson entrance. Just us and one guest." A pause. "No, not that kind of guest. The other kind. The kind you don't ask questions about." Another pause. "Yeah, bring the big light."

  He snapped the phone shut and pointed at Isadora's feet. The embroidered slippers she had worn through the transfer, silk over a leather sole that had been adequate for stone corridors and polished wood floors. Three days on Chicago's sidewalks had worn through the left sole at the ball of the foot.

  "Those ain't gonna survive the tunnels. Pete's corridors are not kind to footwear."

  "I have survived worse than unkind corridors."

  "I know you have. That's what worries me."

  ---

  Pete arrived through the bakery's service door twenty minutes later. He was smaller than Isadora had expected from Sal's description. Thin, five-foot-five at most, in a canvas jacket two sizes too large for his frame. The jacket's pockets bulged with shapes she could not identify. A heavy-duty flashlight hung from a belt loop, and a ring of keys jingled against his right hip with every step. He smelled like engine grease and something sharper underneath, a chemical tang that clung to men who spent too much time in confined spaces with industrial materials.

  He looked at Isadora's robes. His mouth opened. Closed. His eyes tracked up to the copper clasps in her braided hair, lingered there, then dropped to Sal.

  Sal shook his head once. The universal gesture for *don't ask*.

  Pete nodded.

  They left through the service door into the alley. The night air carried cold and the mineral smell of the lake. South Dearborn was quiet, post-dinner hour, the sidewalks populated by couples walking dogs and the occasional cab cutting across intersections. They walked east on Jackson, Sal in the middle, Pete half a step ahead, Isadora behind them both with her hands loose at her sides and her clasps already beginning to register the proximity of the underground current. A faint warmth at her temples. The copper responding.

  Pete stopped at a concrete alcove recessed between two buildings, set back from the sidewalk by four feet. A rusted metal door with a city services stencil, the paint flaked to illegibility. He pulled the key ring from his belt, selected a key with practiced ease, and turned it in the lock. The door opened inward onto a steep stairwell, metal grating underfoot, corroded walls pressing close on both sides.

  Pete's flashlight clicked on. The beam bounced off the walls, catching rust, moisture, a stripe of green mold growing along a seam in the concrete. He went down first. Sal followed, one hand on the railing, the other adjusting his glasses. Isadora entered last.

  The copper clasps brightened.

  ---

  The stairwell descended three flights. The air changed with each landing. Surface air gave way to damp concrete and the metallic tang of old water, then deeper to something Isadora recognized. The sweet-sharp scent that accompanied high-density magical energy. It smelled the same here as it had in her world. Geology did not change with civilizations. The chemistry was the same.

  The stairwell opened into a wide tunnel.

  Thick cable bundles ran along both walls, iron brackets holding them to the concrete. Water mains dripped at intervals from the ceiling, the drops hitting concrete with a rhythm that echoed. Through a mesh partition on the left, CTA track supports ran into a darkness the flashlight could not reach. Somewhere in that darkness, the subsonic rumble of a train passed through the walls.

  Pete moved with practiced efficiency, turning at junctions that looked identical to Isadora, navigating by landmarks invisible to anyone who had not memorized this space: a spray of graffiti, a water stain shaped like a hand, a junction box with a broken latch. He did not speak. He did not need to.

  Isadora walked with both hands raised, palms outward, fingers spread. The posture was deliberate. The same receptive configuration she had used for ley line survey work in her own world, opening the body's conductive channels to register ambient magical fields. Her copper clasps pulsed in a slow rhythm, their amber glow now visible enough to cast light on the tunnel walls. Warm circles of it, moving with her, painting the bundled cables in gold.

  Sal walked two paces behind her. She noticed the distance. It had been one pace at the stairwell entrance. He was watching the clasps and recalculating.

  The Air ley line was massive down here.

  On the surface, she had felt it as a current. A stream running beneath the city, detectable but diffuse, its signal blurred by the noise of traffic and electricity and ten thousand interfering systems. Down here, the noise was stripped away. The density pressed against her sternum like a hand laid flat against her chest. Magical energy flowing along the geological corridor with an intensity that made her skin prickle.

  Her pace slowed. Her breathing deepened, settling into the slow, measured cadence she used when she needed her body quiet enough to register frequencies below conscious perception. The hum she had felt on the lakefront was not faint anymore. It was a low, constant vibration that resonated in her jawbone and made her back teeth ache.

  She pressed the back of her hand against her jaw. Grimaced.

  Pete glanced back, the flashlight beam swinging. "You okay?"

  Sal, behind her: "Iz?"

  She waved them quiet without looking at either of them. Her attention was beneath her feet and above her head simultaneously. The ley line below. The electrical infrastructure above. And between them, the interaction she had felt on the lakefront, except down here it was not faint or uncertain or debatable. It was a physical fact. The two systems were in contact. The copper wiring that carried this city's electrical current ran through the same geographic corridor as the Air ley line, and where they overlapped, the boundary between mundane conduction and magical conduction was permeable.

  She stopped.

  They were at a junction. Two tunnel corridors met at a perpendicular crossing, wide enough for three people to stand without touching. Above them, a thick copper trunk line ran perpendicular to their path, bolted to the ceiling with heavy iron brackets, each bolt the size of her thumb. The trunk line crossed directly over the ley line's path through the bedrock beneath their feet.

  She looked up. Then down. Then up again.

  "Here."

  "Here what?" Sal had his phone in his hand, the screen's blue light catching his glasses.

  "This is where I test my hypothesis."

  "Test it how, exactly?"

  She raised her right hand, palm flat, toward the trunk line overhead. The distance between her palm and the copper was perhaps four feet. She drew a breath. Held it. The clasps flared, their amber glow intensifying until the tunnel walls jumped with light and the shadows behind the cable bundles sharpened to knife edges.

  She channeled a simple Air pulse into the copper wiring above her head.

  Simple. The most basic working in her repertoire. A compression of ambient Air energy into a directed burst, the magical equivalent of flicking a switch. She had cast this spell ten thousand times. She could do it in her sleep. She had done it in her sleep, once, during a particularly vivid dream about a colleague's incompetent ward placement, and woken to find her bedroom curtains blown flat against the ceiling.

  The pulse left her palm. The air between her hand and the trunk line shimmered, a faint geometric distortion that lasted less than a second. The energy entered the copper.

  And vanished.

  Two seconds of nothing. The tunnel was quiet. Pete's flashlight pointed at the floor. Sal's phone screen reflected in his glasses. Water dripped somewhere behind them.

  The author's tale has been misappropriated; report any instances of this story on Amazon.

  Then a sound came from the southeast. A deep metallic crack that echoed through the tunnel like a bell struck from inside a building. The sound traveled through the cable infrastructure first, a cascading hum that ran through every conduit and bracket in the tunnel, making the iron sing. Then through the air, a concussive report that bounced off the tunnel walls and hit Isadora's chest. The overhead fluorescent strips flickered. The section ahead went dark. The section they were standing in guttered, strobed, and died.

  Pete's flashlight was the only light source. Its beam caught dust particles frozen in suddenly still air.

  "What the hell was that?" Pete's voice, high and tight.

  The trunk line above them. The dead transformer somewhere southeast. Isadora lowered her hand an inch, fingers still spread toward the copper overhead. "That was a transformer."

  Sal's phone lit his face. He was reading texts. His thumb scrolled, stopped, scrolled again. The messages were arriving in rapid succession, the phone buzzing against his palm in a staccato rhythm. His expression was not anger. It was the careful blankness she had seen on courtiers learning bad news.

  "Two blocks." His voice dropped to that near-whisper he used for the things that mattered. "Two blocks of the South Loop just went dark. Joey's texting me. Pete's cousin Tony is texting me. The bartender at Rossi's is texting me. Nobody knows what happened but everybody knows power's out from Jackson to Harrison."

  Isadora stood beneath the dead trunk line with her right hand still raised. The copper clasps blazed amber in the dark tunnel, the brightest objects in a corridor that had lost every other light source. Her chest was heaving. The magnitude of what had just happened was settling into her bones.

  She had intended a pulse that would travel the length of this junction. One corridor. Fifty meters, perhaps. Instead the spell had entered the copper wiring and traveled three city blocks through the infrastructure before hitting a transformer with enough force to destroy it. A simple Air pulse, the most basic working she knew, amplified beyond anything she had produced since arriving in this world.

  The copper wiring had not merely conducted her spell. It had compressed the magical energy into a tighter, more potent signal. The cable shaped the energy into something more than she had put in. Everything she understood about magical conduction said the spell should have attenuated over distance, losing amplitude with every junction and splice. Instead it had gained potency.

  Amplification.

  She lowered her hand. Her fingers tingled. She flexed them, opening and closing her fist, and looked at Sal.

  "Chicago's entire power infrastructure is a pre-built ley network."

  The words arrived with the weight of thirty years of study compressed into a single conclusion.

  "I can cast through it. From any point on the grid to any other point on the grid. The copper conducts, and it amplifies."

  But even as she spoke, the triumph was draining from her face. She looked up at the dead fluorescent tubes above her. The transformer she had destroyed was a piece of infrastructure that served thousands of people. The lights in their homes were off. The refrigerators preserving their food had stopped. Medical equipment in buildings within that radius had switched to backup power, if backup power existed.

  The grid was not designed for magical load.

  Every spell she channeled through it would degrade the infrastructure it traveled through. The copper could conduct, yes, and amplify, yes, but the amplification was the copper burning hotter than its specifications allowed, the insulation around the wiring failing, the junction points overloading. She could cast through the grid. And every time she did, she would break a piece of it.

  The exhilaration did not disappear. It moved over, made room for something colder. The calculation of cost. The specific accounting of a scholar who had just realized her most powerful tool was also consumable.

  Sal pocketed his phone. Adjusted his glasses. The lens caught the amber glow of her clasps.

  "I've seen that look on people before." The near-whisper. "It's the look right before they do something expensive."

  "The transformer."

  "Yeah. The transformer. Which is now scrap metal sitting in a substation three blocks from here, and which is gonna have a ComEd repair crew and probably a fire truck on top of it inside of thirty minutes, and which is gonna generate the kind of questions that I personally do not enjoy answering."

  "I understand the cost."

  "Do you? Because two blocks of blackout generates paperwork. Paperwork generates questions. Questions generate the kind of people who show up with badges and no sense of humor, which, I remind you, is already happening at your estate."

  She said nothing. The blackout was not invisible. It was a signal, broadcast to every institution monitoring this city's infrastructure. She had just sent it without thinking about who might be listening.

  "We should return to the surface."

  "Yeah." Sal looked at Pete, who stood pressed against the tunnel wall with his flashlight aimed at the floor and his eyes wide. "Pete. Get us out of here. Different route."

  Pete moved. He turned left where they had come from the right, leading them through an alternate corridor with practiced urgency. The route climbed through older tunnels, narrower, the concrete walls stained with mineral deposits and the cable runs sparser. Isadora walked with her hands at her sides. The clasps dimmed as they ascended, the ley line's intensity receding with every flight of stairs.

  She did not speak. Every junction in the grid was a potential casting point. Every cable run was a potential conduit. The transformer had exploded because the grid's circuit breakers could not handle magical load at that density, but the grid was vast. Thousands of junction points. Hundreds of miles of copper. If she could map the intersections, identify which nodes could sustain the energy and which would fail, calibrate the amplitude of each casting to stay below the infrastructure's tolerance threshold...

  They emerged through a service door into an alley four blocks from where they had descended. Street noise returned, the hum of traffic and distant sirens and the mechanical rhythm of a city that did not know a piece of its skeleton had just snapped.

  ---

  The Jazz Showcase was dark when they arrived. Sal produced a key from somewhere, a spare borrowed from the owner's nephew through whatever chain of favors governed access in his network. The door opened onto a narrow entrance hall that smelled of old wood and stale beer. Beyond it, the venue opened up: a stage at the far end, tables and chairs stacked along the walls, a bar with stools turned upside down on its counter.

  Isadora walked past all of it and climbed the three steps onto the stage.

  She sat cross-legged on the wooden platform and unfolded the document Sal had procured at her request on the walk back: a city electrical map. Printed on paper that crackled when she spread it, showing the grid in diagrammatic form. Substations. Trunk lines. Distribution nodes. Transformer locations marked with small squares. The map covered the Loop and its surrounding neighborhoods in a web of lines that Isadora recognized with a clarity that made her chest tight.

  The web matched the ley line topology.

  Not perfectly. The electrical grid followed streets and property lines, human constraints that the ley lines ignored. But the major trunk routes, the deep infrastructure corridors that carried the highest-capacity lines, those followed the geology. The same bedrock formations that channeled the Air ley line's flow had channeled the engineers' decisions about where to route their heaviest cables. Two civilizations, separated by a dimensional boundary, had built along identical paths because the earth beneath them demanded it.

  She began to mark the map. Her ink-stained fingers traced conduit paths, pausing at each junction where the grid and the ley line overlapped. She borrowed Sal's pen when hers ran dry. Small X marks at intersections. Circles around transformer stations. Annotations in her own language that she would translate later, if translation became necessary, if anyone else ever needed to read what she was building.

  Rainer arrived, summoned by whatever method Sal's network used to move messages. He entered the Jazz Showcase without comment, assessed the space in a single sweep, and located the venue's small kitchen behind the bar. Within ten minutes, tea appeared at Isadora's elbow. She did not look up. He did not expect her to.

  Sal sat at a table near the stage, phone in hand, managing the fallout from the blackout. His voice carried fragments of conversation she half-processed: ComEd crew on site, no injuries, cause listed as equipment failure, his guy at the utility saying the transformer looked like it had been hit by a lightning strike from inside the casing. His network would absorb the fallout. He always did.

  The pen moved and the map filled and the intersections multiplied. By two in the morning, the electrical map was covered in her handwriting, a second layer of information laid over the printed grid, translating the city's mundane infrastructure into the magical topology it had never known it possessed.

  The tea grew cold. Rainer brewed more. Sal fell asleep in his chair with his phone on his chest and his glasses crooked on his nose.

  Isadora traced the last visible junction in the map's coverage area. Set the pen down. Flexed her ink-stained fingers. Looked at the web of marks she had laid across Chicago's bones.

  The Brightening had failed because concrete held no life. But concrete was not the point. It had never been the point. Beneath the concrete, through the concrete, woven into every block and building and buried conduit of this impossible city, a network waited. Pre-built. Pre-routed. Spanning the entire metropolitan grid from the lakeshore to the city limits.

  She did not need moss to hold the gold light. She needed copper.

  The clasps at her temples pulsed once, faint, synchronized to something vast and buried and, until tonight, unknown.