More gunshots rang out, the wight firing blindly at the hollow.

The doors closed halfway, then popped back open. “Clear the doors, please,” came a cheerful prerecorded announcement.

“His feet!” Emma said, pointing at the shoes at the end of the folding man’s long legs, the toes of which were poking through the doors. I scrambled to kick his feet clear, and in the interminable seconds before the doors closed again, the dangling wight fired more wild shots until the hollow grew tired of him and flung him against the wall, where he slid to the floor in an unmoving heap.

The other wight scurried for the exit. Him, too, I tried to say, but it was too little too late. The doors were closing, and with an awkward jolt the train began to move.

I looked around, grateful that the car we’d tumbled into was empty. What would regular people make of us?

“Are you okay?” I asked Emma. She was sitting up, breathing hard, studying me intensely.

“Thanks to you,” she said. “Did you really make the hollow do all that?”

“I think so,” I said, not quite believing it myself.

“That’s amazing,” she said quietly. I couldn’t tell if she was frightened or impressed, or both.

“We owe you our lives,” said Addison, nuzzling his head sweetly against my arm. “You’re a very special boy.”

The folding man laughed, and I looked down to see him grinning at me through a mask of pain. “You see?” he said. “I told you. Is miracle.” Then his face turned serious. He grabbed my hand and pressed a small square of paper into it. A photograph. “My wife, my child,” he said. “Taken by our enemy long ago. If you find others, perhaps …”

I glanced at the photo and got a shock. It was a wallet-sized portrait of a woman holding a baby. Sergei had clearly been carrying it with him a long time. Though the people in the photo were pleasant enough, the photo itself—or the negative—had been seriously damaged, perhaps narrowly survived a fire, exposed to such heat that the faces were warped and fragmented. Sergei had never mentioned his family before now; all he’d talked about since we met him was raising an army of peculiars—going loop to loop to recruit able-bodied survivors of the raids and purges. He never told us what he wanted an army for: to get them back.

“We’ll find them, too,” I said.

We both knew this was far-fetched, but it was what he needed to hear.

“Thank you,” he said, and relaxed into a spreading pool of blood.

“He doesn’t have long,” Addison said, moving to lick Sergei’s face.

“I might have enough heat to cauterize the wound,” said Emma. Scooting toward him, she began rubbing her hands together.

Addison nosed the folding man’s shirt near his abdomen. “Here. He’s hurt here.” Emma put her hands on either side of the spot, and at the sizzle of flesh I stood up, feeling faint.

I looked out the window. We were still pulling out of the station, slowed perhaps by debris on the tracks. The emergency lights’ SOS flicker picked details from the dark at random. The body of a dead wight half buried in glass. The crumpled phone booth, scene of my breakthrough. The hollow—I registered its form with a shock—trotting on the platform alongside us, a few cars back, casual as a jogger.

Stop. Stay away, I spat at the window, in English. My head wasn’t clear, the hurt and the whine getting in the way again.

We picked up speed and passed into the tunnel. I pressed my face to the glass, angling backward for another glimpse. It was dark, dark—and then, in a burst of light like a camera flash, I saw the hollow as a momentary still image—flying, its feet lifting from the platform, tongues lassoing the rail of the last car.

Miracle. Curse. I hadn’t quite worked out the difference.

* * *

I took his legs and Emma his arms and gently we lifted Sergei onto a long bench seat, where beneath an advertisement for bake-at-home pizza he lay blacked out and rocking with the motion of the train. If he was going to die, it seemed wrong that he should have to do so on the floor.

Emma pulled up his thin shirt. “The bleeding’s stopped,” she reported, “but he’ll die if he doesn’t see the inside of a hospital soon.”

“He may die anyway,” said Addison. “Especially in a hospital here in the present. Imagine: he wakes up in three days’ time, side healed but everything else failing, aged two hundred and bird-knows-what.”

“That may be,” Emma replied. “Then again, I’ll be surprised if in three days’ time any of us are alive, in any condition whatsoever. I’m not sure what more we can do for him.”

I’d heard them mention this deadline before: two or three days was the longest any peculiar who’d lived in a loop could stay in the present without aging forward. It was long enough for them to visit the present but never to stay; long enough to travel between loops but short enough that they were never tempted to linger. Only daredevils and ymbrynes made excursions into the present longer than a few hours; the consequences of a delay were too grave.

Emma rose, looking sickly in the pale yellow light, then tottered on her feet and grabbed for one of the train’s stanchions. I took her hand and made her sit next to me, and she slumped against my side, exhausted beyond measure. We both were. I hadn’t slept properly in days. Hadn’t eaten properly, either, aside from the few opportunities we’d had to gorge ourselves like pigs. I’d been running and terrified and wearing these damned blister-making shoes since I couldn’t remember when, but more than that, every time I spoke Hollow it seemed to carve something out of me that I didn’t know how to put back. It made me feel tired to a degree that was wholly new, absolutely subterranean. I’d discovered a fresh vein inside me, a new source of power to mine, but it was depletable and finite, and I wondered if by using it up I was using myself up, too.

I’d worry about that another time. For now I tried to savor a rare moment of peace, my arm around Emma and her head on my shoulder, just breathing. Selfishly, perhaps, I didn’t mention the hollow that had chased our train. What could any of us do about it? It would either catch us or not. Kill us or not. The next time it found us—and I was sure there would be a next time—I would either find the words to stay its tongues or I wouldn’t.

I watched Addison hop onto the seat across from us, unlock a window with his paw, and crack it open. The angry sound of the train and a warm funk of tunnel air came rushing in, and he sat reading it with his nose, eyes bright and snout twitching. The air smelled like stale sweat and dry rot to me, but he seemed to catch something subtler, something that required careful interpretation.

“Can you smell them?” I asked.

The dog heard me but took a long moment to reply, his eyes aimed at the ceiling as if finishing a thought. “I can,” he said. “Their trail is nice and crisp, too.”

Even at this high speed, he could pick up the minutes-old traces of peculiars who’d been enclosed in an earlier train car. I was impressed, and told him so.

“Thank you, but I can’t take all the credit,” he said. “Someone must’ve pushed open a window in their car, too, otherwise the trail would be much fainter. Perhaps Miss Wren did it, knowing I would try to follow.”

“She knew you were here?” I asked.

“How did you find us?” Emma said.

“Just a moment,” Addison said sharply. The train was slowing into a station, the windows flashing from tunnel black to tile white. He stuck his nose out the window and closed his eyes, lost in concentration. “I don’t think they got off here, but be ready in any case.”

Emma and I stood, doing our best to shield the folding man from view. I saw with some relief that there weren’t many people waiting on the platform. Funny there were any at all, or that trains were still running. It was as if nothing had happened. The wights had made sure of it, I suspected, in hopes we’d take the bait, jump onto a train, and make it simple for them to round us up. We certainly wouldn’t be hard to spot amongst modern London’s workday commuters.