As the first viral launched itself toward the Humvee, Alicia reached out, snatching Sara’s wrist off the steering wheel, and pulled. Sara swung out on Alicia’s arm in a wide arc, separating from the vehicle as it swerved away. For a horrible instant her eyes met Peter’s as her feet skimmed the ground—the eyes of a woman who was going to die and knew it. But then Alicia pulled again, hard, drawing her upward, Sara’s free hand found the ladder, and the two of them were climbing; Sara and Alicia were up and rolling into the cab.

Which was when it happened. An earsplitting boom, like thunder: the engine lurched violently forward, free of its weight; everything in the cab was suddenly airborne. Peter, standing by the open hatch, was slapped off his feet and hurled backward, his body slamming into the bulkhead. He thought: Amy. Where was Amy? And as he tumbled to the floor he heard a new sound, louder than the first, and he knew what this sound was: a deafening roar and a screech of metal, as the cars behind them jumped the rails, jackknifing into the air and careering like an avalanche of iron across the desert floor, everyone inside them dead, dead, dead.

They came to a stop at half-day. The end of the line, Michael said, powering down. The maps Billie had shown them indicated that the rails petered out at the town of Caliente. They were lucky the train had taken them this far. How far? Peter asked. Four hundred kilometers, give or take, said Michael. See that mountain ridge? He was pointing through the slitted windshield. That’s Utah.

They disembarked. They were in some kind of railyard, with tracks all around, littered with abandoned cars—engines, tankers, flatbeds. The land here was less dry; there was tall grass growing, and cottonwoods, and a gentle breeze was blowing, cooling the air. Water was running nearby; they could hear the sound of birds.

“I just don’t get it,” Alicia said, breaking the stillness. “Where did they hope to get to?”

Peter had slept in the train, once it was clear no virals were pursuing them, and awakened at dawn to find himself curled on the floor beside Theo and Maus. Michael had stayed up through the night, but the ordeal of the last few days had eventually caught up with everyone. As for Olson: perhaps he’d slept, though Peter doubted it. The man had spoken to no one and was now sitting on the ground outside the engine, staring into space. When Peter had told him about Mira, he hadn’t asked for any details, just nodded and said, “Thank you for letting me know.”

“Anywhere,” Peter answered after a moment. He wasn’t sure what he was feeling. The events of the night before—the whole four days at the Haven—felt like a feverish dream. “I think they just wanted to get … anywhere.”