Gotham's storm drains always brought Gordon back to the Lazlo Valentine case.
Valentine had been a quiet man — nondescript, the kind of face that didn't catch in memory — with a severe dissociative disorder and a sustained interest in children he'd taken from playgrounds and parks across the lower East Side over an eighteen-month period. When Gordon and Bullock had finally traced him underground, they'd found the results of his ambition: bodies, or what he'd made of them. He'd believed he could stitch something new together from the parts, produce something living. The theology of it was his own.
What he'd actually produced was a nightmare of sutures that had never drawn breath.
They'd taken him without much difficulty. The disorder had saved him from a proper sentence and routed him to Arkham instead. Gordon had gone to check on him a few months back — professional habit, the same instinct that made him re-read old case files on quiet afternoons. Valentine had been calm. Pig mask, medical textbooks stacked beside the bed, reading with methodical patience.
The quiet had worried Gordon more than the screaming ever had.
"You're thinking about Valentine," Bullock said. "I can tell by the face."
"You're annoyingly perceptive for someone who just walked through a biohazard scene eating a cigar."
"It's a talent." Bullock shrugged and swept his flashlight across the tunnel wall.
The sewer system beneath Gotham was old enough that its oldest sections predated the country itself. French engineers had laid the original framework while the Revolution was still being fought upstate, and every generation since had added to it, rerouted it, expanded it, until what remained was less a utility system than a geological formation — layered, contradictory, and in several places genuinely unmapped.
Gordon navigated by the city survey he'd pulled from the records office, holding it at arm's length in the flashlight beam. Bullock moved a half-step behind him, chalk in hand, marking the walls at each turn.
The evidence trail was visible enough — claw gouges in the brickwork, regular and deep, running in straight lines that suggested something large moving with purpose rather than at random. Gordon followed them and didn't think too hard about the scale of what had made them.
They'd been moving for nearly two hours when he stopped.
"We've been here," he said.
"Can't have been. I've been marking as we go."
Gordon swept the light across the wall. The chalk mark that should have been there wasn't.
Bullock held up his chalk. The stick was worn down to a stub.
"Someone's been behind us," Gordon said quietly.
"You know what, I had that feeling and I chose not to—"
The floor moved.
Not much — a vibration, felt through the soles of the shoes rather than heard, like something massive shifting its weight on the level below. Gordon looked down. The water around his shins had gone from still to rippling, small concentric rings spreading outward from a point ahead of them.
Bullock's face said: I know what this is and I am refusing to engage with it.
Gordon raised his weapon.
"Stop pretending."
The second tremor came harder — a rolling shudder through the brickwork, a wave of displaced water that hit them at thigh height and soaked the rest. From somewhere down the corridor, beyond the reach of the flashlight, came a sound.
Breathing. Very large. Getting closer.
They didn't discuss it.
Gordon's Ruger GP100 held six rounds of .357, with an effective range of around a hundred meters under good conditions. These were not good conditions. The tunnel narrowed every thirty meters, the light reached maybe twenty, and whatever had produced those claw marks on the casino wall had been standing somewhere between seven and nine feet tall based on Gordon's measurements.
He ran the math and kept running.
Behind them the breathing came and went — close, then distant, then close again — with a pattern that didn't fit a pursuit. Something chasing in a straight line would either be gaining or falling back. This was neither.
Gordon slowed his steps.
It's not chasing us.
The thought arrived fully formed and cold.
It's herding us.
"Bullock—"
But Bullock's fear had bypassed the rational brain entirely and gone straight to the legs. Gordon lunged for his partner's collar, caught it, and their combined momentum carried them sideways into a drainage overflow channel set into the tunnel wall — a narrow slot, waist-high current, leading down.
The floor disappeared.
They dropped.
Two levels below, Will heard it before he saw it.
Two impacts in quick succession — heavy, wet, human — from the overflow above. Then two people in plainclothes hitting the water hard enough to go under and come up gasping.
"Aaaahhh—"
Will's hand went to his mouth.
Selina grabbed his arm.
The two figures floundered upright in the chest-deep water. The shorter one had lost his flashlight. The taller one had managed to keep hold of his and swept it across the tunnel — catching, in sequence: dripping brickwork, a rusted pipe junction, Selina's leather suit, and Will's face.
The flashlight stopped.
Gordon stared at him.
Will stared back.
Bullock was still coughing water.
"You," Gordon said.
"Detective."
A silence that had several things in it.
"What are you doing in the Gotham storm drains at—" Gordon checked his watch, held it to the light. "—two in the morning."
"Exploring," Will said. "You?"
"Police business."
"Same, more or less."
Bullock had recovered enough to register the leather-clad woman beside Will. His expression rearranged itself into something professionally neutral that didn't quite hold.
Selina gave him nothing in return.
"You need to leave," Gordon said, not loudly. "Both of you. Whatever's down here, it's not a situation for civilians."
"We've been down here longer than you have," Selina said. "And we're still walking."
"I noticed someone erasing your chalk marks," Will added. "Level above. Small — I didn't get a clear look."
Gordon went quiet. His eyes moved to the overflow channel they'd come through, then back to Will. He was recalculating something.
"How long have you been down here?"
"Long enough." Will paused. "We were being followed. Breathing, ground vibration, same as what you heard. We stopped and waited it out."
"And?"
"Nothing came around the corner."
Gordon absorbed this. His grip on the weapon eased by one degree.
"You think it's a bluff," he said.
"I think whatever Strange built, it's operating on instructions. It had two separate groups in the same tunnel system, moving in two different directions, and it wasn't attacking either of them." Will looked down the corridor ahead. "That means it wants us going somewhere specific. Which means there's something at the destination that does the actual work."
Bullock had stopped wringing out his sleeve and was paying attention now.
Gordon studied Will for a long moment — the kind of look that was cross-referencing this conversation against a previous one, filing it, testing the fit.
"You're the naked man," he said. "From the precinct. Three months ago."
"I was cold."
"You asked me about Batman."
"I was confused."
"And Bruce Wayne."
"Also confused."
Bullock looked between them. "Do you two know each other?"
"No," they both said.
Another silence.
Gordon holstered his weapon. "There's something ahead of us that this creature wants us to find. You're saying don't go forward."
"I'm saying if we go forward, we go knowing that."
Gordon looked at the tunnel ahead. Then at Selina. Then at Will, with the specific expression of a man who had been a detective long enough to know when he was getting a partial answer and had decided, for reasons of his own, to accept it.
"Stay behind us," he said.
"We were ahead of you thirty seconds ago," Selina pointed out.
"Stay beside us," Gordon amended. "And if this goes wrong, you run."
"Obviously," she said.
The four of them moved forward into the dark, the single remaining flashlight casting one thin column of light against the black ahead of them, the water around their legs cold and slow and still.