Hollis ducked away, keeping one hand gripped on Caleb’s foot; Peter grabbed the other. Together they pushed the boy upward, propelling Caleb over the lip of the door.

Peter ascended the same way. From the roof of the car he could see that the mass of virals, having passed through the tunnel, had broken apart into three groups—one directly behind them, two following on either side. They were racing in a kind of gallop, using both their hands and their feet to propel themselves forward in long leaps. Alicia was shooting at the head of the central group, which had closed to within ten meters. Some went down, dead or injured or merely stunned he couldn’t tell; the pod closed over them and kept coming. Behind them the other two groups began to merge, passing through one another like currents of water, separating once again to re-form their original shapes.

He lay on his belly beside Caleb and reached down as Hollis lifted Mira up; they found the frightened girl’s hands and pulled, drawing her onto the roof.

Alicia, below them: “Get down!”

Three virals were on the roof of the last boxcar now. A blast of fire erupted from the Humvee and they jumped away. Caleb was already vaulting across the gap to the engine. Peter reached for Mira but the girl was frozen in place, her body pressed to the roof of the car, her arms hugging it as if it were the one thing that might save her.

“Mira,” Peter said, trying to pull her free, “please.”

Still she held on. “I can’t, I can’t, I can’t.”

From below, a clawed hand reached up, wrapping around her ankle. “Poppa!”

Then she was gone.

There was nothing else he could do. Peter dashed toward the gap, took it at a leap, and dropped through the hatch behind Caleb. He told Michael to hold the train steady and swung open the door to the cabin and looked aft.

The virals were all over the third boxcar now, clinging to the sides like a swarm of insects. So intense was their frenzy that they appeared to be fighting with one another, snapping and snarling for the right to be the first ones inside. Even over the wind, Peter could hear the screams of the terrified souls inside.

Where was the Humvee?

Then he saw it, racing toward them at an angle, bouncing wildly over the hardpan. Hollis and Olson were clinging to the vehicle’s roof. The big gun was depleted, all its ammo spent. The virals would be all over them any second.

Peter leaned out the door. “Bring it closer!”

Sara gunned the engine, drawing alongside. Hollis was the first to grab the ladder, then Olson. Peter pulled them through into the cab and called down, “Alicia, you go!”

“What about Sara?”