The ward died first.

  Isadora was asleep on the Jazz Showcase stage, the stolen electrical map folded twice beneath her head, the charcoal annotations pressing ink ghosts into her cheek. The Fire node pulsed in the back of her skull, four seconds on, four seconds off, a thermal metronome she had calibrated her breathing to sometime in the last seventy hours. The ward hum layered over it, twelve blocks of signal feeding data through the copper clasps she had unpinned from her braids and set on the stage beside her ear. Body heat signatures, patrol movements, the slow drift of weather fronts through the Air ley line.

  At 3:47 AM, the signal died.

  The hum cut out. A severance. One second the ward network was feeding her fourteen officers, three vehicles, two on Michigan and one on Van Buren, and the next second there was nothing but the stage floor under her back and the sound of her own blood in her ears.

  Isadora sat upright. The darkness was total. The Jazz Showcase's emergency lights had died with the mains, which meant the backup generator was gone too, which meant this was not a breaker trip. She reached for the Fire node link, the conduit she had spent forty minutes building through the cables beneath Van Buren, and the sensation was like pressing her hand against solid resistance where her awareness used to flow.

  Gone. Flickering. Gone again. A spasm of thermal energy surged through the link and she felt it behind her sternum, a flush of heat that came and went in the space between two heartbeats. The Fire node was still there. The electrical infrastructure carrying the conduit was not.

  She pressed both palms flat against the stage floor. The wood was cold. The ward constructs she had threaded through the cables beneath the Jazz Showcase sat silent. Every conduit she had built, every junction she had tapped, every thread of Air magic riding Chicago's electrical grid had lost its carrier signal.

  Twelve blocks of perception, gone.

  Footsteps in the dark. Rainer, moving through the venue with the measured stride of a man who had memorized the room's dimensions, the distance between the piano and the bar, the three steps down from the stage to the floor. A small flame bloomed in his cupped hand, Fire magic drawn from his own reserve rather than the ley line, and the candlelight caught the angles of his face. Calm. Prepared. Nightclothes beneath a belted outer robe, satchel already on his shoulder because Rainer slept with it within arm's reach in every unfamiliar place, and Chicago had been unfamiliar for weeks.

  At the entrance, a pale blue-white shimmer stuttered into existence. Brielle's ward, thrown across the doorway with more force than precision. The construct guttered, brightened, guttered again. Brielle stood behind it with both hands raised and her jaw clenched so tight the tendons in her neck stood out in the candlelight.

  "Hold it steady." Isadora did not look at her. She was standing now, center stage, hands at her sides, fingers curled into her palms. "Steady, Brielle. Not harder."

  Rainer climbed the stage steps and held out a candle.

  Isadora waved it off. The candlelight was wrong. She needed to feel the network return, not see a room she already knew. The Fire node flickered against her sternum again, present, absent, present, and each absence was a flinch she kept off her face. The grid map was crumpled where she had rolled off it. Coffee cups from two days ago anchored the corners of the stage. A pencil stub had fallen into the gap between the floorboards and she could hear it rolling faintly in the vibration from the street.

  The signal was gone. The ward was gone. The twelve-block radius she had built over days of sustained casting, the infrastructure that let her count officers and time patrol rotations and feel the Stasis pulse ticking through the bones of the city...

  She counted her own heartbeat. Sixty-two beats per minute. It was the only data she had.

  Eighty heartbeats. Ninety. The darkness pressed in and the candlelight behind her made it worse, because the light stopped at the walls and beyond the walls there was a city she could not read. One hundred heartbeats. Rainer set the candle on the piano and stood two paces behind her, his silence absolute, his presence a weight she answered by not turning around.

  One hundred forty. The ward was still down. The Fire node had stopped flickering entirely. Dead connection, cold floor, and the sound of Brielle's breathing near the entrance where the ward was holding, barely, the blue-white light throwing shadows that jumped with every unsteady pulse.

  The front door banged open. Cold air flooded the venue and with it came Sal, phone pressed to his ear, two more buzzing in the jacket he had thrown over what was clearly a pajama shirt, the buttons misaligned, his wire-rimmed glasses crooked on his nose. He ended the call and pocketed the phone and the other two kept buzzing.

  "Iz. You okay?"

  "What happened."

  "Sixteen blocks. Congress to Roosevelt, everything east of State. ComEd's losing their minds. I got a guy at the Harrison substation, he says..."

  He trailed off because he was looking at her. Standing in the middle of an unlit stage without candle or ward or clasps, in rumpled robes she had slept in for three days. She knew what she looked like. She did not move.

  "What does he say, Sal."

  "Says the substation overloaded. Some kind of inductive spike in the underground cables. His word, not mine. Spike. Like something pushed a current through the cables that the system wasn't built to handle, and the breakers tripped in sequence all the way down the line." He set his phone on the piano lid. The buzzing stopped. He folded his arms and the candlelight stripped the performance out of his face, left it sharp and tired and uncertain. "His exact words were 'something that was not electrical.' ComEd's scrambling crews, but nobody knows what tripped the cascade."

  "I do."

  Sal waited.

  "The resonance. The signal I have been tracking since..."

  "The four-axis thing."

  "Yes. It has been riding the electrical conduits for weeks. The cables carry it because the grid follows the same corridors as the ley lines, and the signal's coherence lets it propagate through copper the way it propagates through the magical substrate. I told you this."

  "You told me it was predictable."

  The word landed. Sal did not move his arms. His glasses caught the candlelight.

  "You told me you could time it to the second, Iz. You said, and I'm quoting here, 'the rhythm is constant, four seconds, I can work around it.' So I'm asking. If you could time it to the second, how come you didn't see a sixteen-block blackout coming?"

  Her hands tightened at her sides. The signal had been riding the cables at increasing amplitude for days. She had measured the increase, noted it, decided she could manage it, and continued building infrastructure on top of infrastructure that was never designed to carry magical energy at those levels. An overload was not a surprise. It was an inevitability she had declined to calculate.

  "I was wrong."

  Sal blinked. His arms unfolded.

  "The amplitude was increasing. I monitored the increase. I did not extrapolate the failure point because I was focused on the signal's content rather than the signal's load on the carrier medium." She paused. "That was a mistake."

  "Okay." He rubbed his jaw. "Okay, so what do we..."

  The lights came on.

  The fluorescents blinded her after twenty minutes of candlelight. Isadora's hands reached blindly for the stage edge and then dropped because it was not the light that had stunned her. The Fire node reconnected. A rush of thermal energy flooded the conduit, the ward network surged back to life, and twelve blocks of data slammed into her awareness.

  She grabbed the edge of the stage. The ward was back. The wards were back, every thread she had built humming with restored electromagnetic baseline, the Fire node hot and alive behind her sternum, the Air conduits carrying signal through the cable network. The entire twelve-block radius snapped into focus.

  But the data was wrong.

  She straightened. Walked two steps to the left. Raised one hand, palm out, fingers spread, and pushed her awareness through the ward network the way she had done a hundred times in the last three days. The signal was there. The Stasis resonance, the four-axis pulse, the impossibly clean frequency that had been ticking through the ley line with metronomic precision since the Jackson Street tunnel.

  It was stuttering.

  Not ticking. Not pulsing. Stuttering. The clean interval was broken, the four-second rhythm fractured into irregular bursts. Two seconds, then six, then one, then three and a half. The frequency itself was drifting, shifting up and down in a range she could feel but could not quantify from the stage. And the quality... the quality was different. The signal that had been mechanical, precise, inhuman in its consistency, was now uneven. A rhythm that halted and restarted. Something alive. Something that had stumbled and was catching its balance.

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  "Something changed." She walked across the stage, hand still raised, tracing the ward network's new topology. "The signal. It is different."

  Sal looked at her hand in the air. "Different how?"

  "I need to get closer." She turned to Rainer. "Candle."

  Rainer picked up the candle from the piano and held it out. His mouth opened.

  "I am going into the tunnels. Do not follow me."

  His mouth closed. He held the candle steady and his expression did not change, but his hand did not release the candle for a full second after she gripped it.

  She took the service tunnel entrance beneath the Jazz Showcase, the same route Pete had showed her during the heist, the corridor she now knew well enough to walk without a guide. The tunnel air was warm and wet, rust and standing water and the mineral heat radiating from the Fire node link pulsing through the cables along the ceiling. But the heat was wrong too. Surging and fading with the stuttering signal, warm and cold and warm again, the thermal conduit fluctuating without rhythm.

  She crouched in the service corridor thirty feet below street level, set the candle on the concrete, and pressed her palm flat against the tunnel floor. The copper clasps in her braids pulsed in uneven flares, amber light dimming and brightening in the enclosed space.

  The ley line was right there. Inches of concrete between her hand and the subterranean Air corridor that ran from the lakefront to the western suburbs. She pushed her awareness into it, past the electrical interference, past the cable noise, down to the raw magical substrate.

  The Stasis signal was there. Same axis. Same coherence on the fourth variable, the one her training had no name for, the one that operated in a dimension her world's magic did not use. But the signal was broken. Fractured. The fundamental tone still present but distorted by harmonics that should not be there.

  She sat back against the tunnel wall. Closed her eyes. Replayed the sequence.

  The signal had been steady. Four seconds. Constant. She had timed it for days.

  At 3:47 AM, the signal broke. Not after the power went out. Not because the power went out. The signal broke, and the broken signal sent a discordant spike through the electrical conduits, and the spike exceeded the cable's inductive tolerance, and the Harrison Street substation's breakers tripped in sequence.

  The causality ran backward from what Sal assumed.

  She opened her eyes. The candle flame was steady in the still tunnel air. Her hands were still in her lap.

  Something had happened at the source.

  The signal had not failed because Chicago's grid failed. Chicago's grid failed because the signal failed. Whatever was producing the pulse, whatever was ringing that clean, coherent, impossible frequency through the ley line network, had experienced a disruption. A fracture. A mistake. And the shockwave of that mistake had propagated through the dimensional connection, ridden the ley line into the electrical grid, and blown out sixteen blocks of South Loop power infrastructure.

  She stood. Collected the candle. Climbed the service tunnel back to the Jazz Showcase.

  ---

  Sal was on the phone again when she emerged. He ended the call.

  "ComEd's got crews on Harrison. They're saying transformer damage, maybe three, four hours to full restoration for the outer blocks. The core sixteen are back on the main feed." He paused. "You look like you figured something out."

  She crossed to the stage and spread the electrical map flat. It was creased from being slept on, the charcoal annotations smeared where her cheek had pressed against the Van Buren corridor. She picked up the charcoal stub from beside the coffee cups and began drawing.

  The old signal pattern: steady marks, evenly spaced, four seconds apart. She drew them across the top of the map in a clean row.

  The new signal pattern: irregular, clustered, drifting. She drew those beneath the first row, the marks uneven, the spacing erratic.

  "The signal changed." Her voice was quieter than before. "Not during the outage. Before it. The signal's disruption caused the electrical surge. Not the other way around."

  Sal leaned on the piano. His coin was in his hand again, rolling across his knuckles in the slow, deliberate pattern that meant he was thinking rather than fidgeting.

  "You're saying the thing that's been humming through the wires for weeks just... broke?"

  "It did not break. It stuttered. The fundamental signal is still there, still coherent, still operating on the fourth axis. But the rhythm failed. The precision failed." She set down the charcoal and looked at the two rows of marks. Clean pattern above. Broken pattern below. "Something happened at the point of origin. Not here. Not in the cables or the ley line or the grid. At the source. Wherever the source is."

  "Which you keep telling me is not here."

  "It is not here."

  "And it's not your world."

  "It is not."

  Sal's coin stopped. He held it between his thumb and forefinger, pressing it flat, the edge digging into his skin.

  "So what are you telling me, Iz?"

  She met his eyes. The fluorescent light was harsh on both of them, the candlelit intimacy of the blackout replaced by the flat white glare of a restored power grid. Rainer stood at the foot of the stage. Brielle had dropped her ward when the lights returned and was sitting on the floor near the entrance, exhausted from holding the construct for twenty minutes on raw talent and no sleep.

  "The signal is not a natural phenomenon. Geological processes do not make mistakes. Ley line resonance does not lose its rhythm and then attempt to reestablish it. This signal changed because something went wrong at the source, and the change has the characteristics of an interruption, not a degradation." She picked up the charcoal again and tapped the lower row of marks. "This is acute. Something broke, and the signal carried the break."

  "Something."

  "Someone." She set the charcoal down. "The bell-ringer made a mistake. Which means the bell-ringer is a person."

  Sal's coin was still between his fingers. He did not move it. His eyes behind the crooked glasses were focused on hers with an intensity she had not seen from him before, stripped down to the calculating mind underneath.

  "Right, so there's a person somewhere that isn't here and isn't your world, who's been ringing a bell that shakes a city." His voice dropped to the near-whisper. "What do we do about a person we can't see, in a place we can't reach?"

  Isadora did not answer. Her hand hovered over the map, charcoal suspended between her fingers. The ward network fed her data, the twelve-block radius of electromagnetic-magical perception restored and humming, and within that data the Stasis signal continued to stutter. Irregular. Unsteady. The source had not repaired. The signal limped through the ley network with uneven intervals, its amplitude working to compensate for damage it could not fix.

  She kept the observation to herself. Some conclusions needed to settle before she spoke them, and the implications of a damaged source, a fallible source, a source that could break and did not immediately recover...

  She pulled the charcoal back and began annotating the frequency drift in the margin of the map.

  The sound came from the east.

  A distant crash, high and bright and musical, the kind of sound that glass makes when it falls a long way and hits concrete. Not a single break. Three impacts in rapid succession, so close together they blurred into a single chord. Twenty stories of plate glass hitting the sidewalk on Lake Shore Drive.

  Isadora closed her eyes. The ward network confirmed it before the echoes died. Three windows, residential tower, eastern face, the Air ley line corridor. The geometric crack pattern she had first detected on State Street, the one that had been propagating through the tempered glass for days, had completed its work. Stressed lattice, resonant frequency, catastrophic failure. The glass had held while the signal was steady. The signal's disruption had changed the harmonic, and the change was worse than the constant. A steady vibration, a structure can endure. An erratic one tears it apart.

  She opened her eyes. Sal was already looking at her.

  The predawn darkness outside the Jazz Showcase windows was thin now, the first grey light showing in the gaps between buildings. Somewhere to the east, glass dust was settling on an empty sidewalk twenty stories below three shattered windows. Sirens started, faint and distant, the city's automated response to a structural failure no engineer would be able to explain.

  No one was on the sidewalk.

  Isadora looked at Sal. He was already watching her. Neither spoke.

  This time.