My skin crawled. “They’re set to autosterilize if there’s any sign of contamination, aren’t they?”

“Yes, they are. My suggestion?” Kelly paused before finishing, grimly, “Go as fast as you possibly can. Follow the yellow lights. They’ll lead you to an exit. As long as your infection status hasn’t changed, it’ll let you out.”

“And if it has?”

“If anyone in the escape corridor goes into conversion, the autosterilize initiates.”

“Fuckin’ swell. Okay. Tell Alaric I’ll call back if we’re not dead.” I cut the connection over her protests, yanking the ear cuff off and shoving it into my pocket as I turned to Becks. “We’re pulling a last run. Once this door is open, you haul ass, and if the lava comes down while we’re inside, it was nice knowing you.”

“Got it,” said Becks, with a small, tight nod. It wouldn’t actually be lava. It would be a highly acidic chemical bath, followed by flash irradiation, followed by another chemical bath, until everything organic in the corridor had been reduced to so much inert slime. That sort of thing can’t really happen in places where humans are expected to be on a regular basis, since it tends to render the environment permanently toxic, but for a rarely used, last-ditch exit, it made perfect, if horrible, sense.

I hesitated, and then offered her my hand. “It was nice knowing you, Rebecca,” I said.

“The same, Shaun. Believe me, the same.” She laced her fingers into mine and smiled wistfully. “Maybe when we get out of this alive, you and me can go for coffee or something.”

“Sure,” I said. She didn’t let go of my hand, and I didn’t pull away. Leaving our fingers tangled together like computer cables, I reached for the second door and pulled it open. An amber light clicked on across from us. Becks and I exchanged one final look before stepping through the doorway, into the relative darkness on the other side.

e door swung shut as soon as we were through, hydraulics engaging with a loud hiss that was almost reassuring. It meant all systems were go; even if those systems got us dissolved, they’d be doing so while fully operational. Another amber light clicked on to the left of the first one, and another, and another, until a line of tiny glittering beacons led the way deeper into the dark.

There was no other way to go, and Kelly’s instructions said to follow the light. We’d trusted her this far. The worst that trusting her the rest of the way could get us was dead. “Come on,” I said. We started in the direction indicated by the lights, moving as fast as we dared.

Distances always seem longer in the dark. The greater the darkness, the longer the distance. The amber lights were meant to guide us, not show us where we were going, and even my flashlight wasn’t enough to beat back the shadows. We probably traveled no more than a few hundred yards, but it felt like ten or twelve times that. Our breath was impossibly loud in the confines of the tunnel, and my toes kept catching on the floor, which wasn’t completely level. After the third time I almost tripped, I realized we were running across the floor of an enormous shower, complete with drains every ten feet. They’d be essential if the CDC ever needed to sluice the place down—say, after melting a few unwanted guests. I sped up, pulling Becks along with me. She didn’t argue. She was smart enough to want out of there as badly as I did.

The amber lights winked out about thirty seconds after we passed them, winking on ahead of us at the same rate. After the second time I looked back into the encroaching darkness, I forced myself to stop looking. It wasn’t doing a damn bit of good, and it was doing damage to my nerves that I really couldn’t afford.

I’m here, said George.

I squeezed Becks’s hand and kept going.

The amber lights led us around a corner and into a narrower hallway with lights lining the walls on either side. They were still small, but they were plentiful enough to show the outline of Becks’s face and shoulders. Being able to see her walking beside me lowered my stress levels like nothing else. I saw her head turn toward me, and I felt her fingers relax around mine as the same wave of relaxation washed over her. Maybe it was going to be okay.

The lights continued lighting up in front of us, finally circling a door frame directly ahead. Becks and I broke into a sprint at the same time, heading for the exit at full speed. I got there half a step before she did, purely by virtue of having longer legs, and I grabbed the door handle with my free hand. Needles stung my palm, biting deep and then—unlike every other blood test I’d ever taken—staying where they were as the light above the door flashed between red and green. The light stopped on green, and then went out, replaced by a single green bulb off to the left. The needles withdrew. The door didn’t open.

“Oh, those slick bastards,” I muttered, pulling my hand away. “Your turn, Becks. They’re not going to let us out of here until we’re both clean.”

“Yippee,” she deadpanned, and stepped up to take my place. The lights repeated their flickering dance, and a second green bulb came on next to the first. The latch released and the door swung inward, knocking us both back a sep. Cool air rushed into the hallway like a benediction. I took a deep breath, glorying in the taste of clean air, and let Becks pull me for a change, hauling me into the light.

Kelly’s emergency exit let out on the edge of the employee parking lot. About a dozen people were already there, most wearing lab coats… and there, off to one side, was Director Swenson. He was standing in a small cluster with two of the people in lab coats and Miss Lassen, the receptionist. She was the first to see us. Her shoulders went stiff as she straightened, whispering something urgently to the director. He turned his head in our direction, and his eyes widened before he could compose himself.