They followed his voice around to the far side. Tipped onto its side was the shell of some kind of small aircraft.

“It’s a helicopter,” said Michael.

Caleb was standing on top of the fuselage. Before Peter could speak, Caleb had pulled the door open, like a hatch, and dropped down inside it.

“Hightop,” Alicia called, “be careful!”

“It’s okay! It’s empty!” They heard him rummaging around the interior; a moment later, his head popped through the hatch. “Nothing here, just a couple of slims.” He chinned himself up. He slid down the fuselage and showed them what he’d found. “They were wearing these.”

A pair of necklaces, tarnished from exposure. To each was attached a silver disk. Peter used some of his water to rinse the tags clean.

Sullivan, Joseph D. O+ 098879254 USMC Rom. Cath. Gomez, Manuel R. AB– 859720152 USMC No pref.

“USMC—that’s Marine Corps,” Hollis said. “You should put these back where you found them, Caleb.”

Caleb snatched the necklaces from Peter’s hand, clutching them protectively against his chest. “No way. I’m keeping these. I found them, fair and square.”

“Hightop, they were soldiers.”

Caleb’s voice was suddenly shrill. “So what? They never came back, did they? The soldiers were supposed to come back for us, and they never did.”

For a moment, no one spoke. “That’s what this place is, isn’t it?” Sara said. “Auntie used to tell stories about it. How the First Ones came from the cities, to ride the buses up the mountain.”

Peter had heard these stories, too. He’d always thought of them as just that, stories. But Sara was right; that’s what this place was. More than the buses themselves, or the fallen helicopter with its dead soldiers inside, the stillness told him so. It was more than the simple absence of sound; it was the silence of something stopped.

A feeling jarred him then, a prickling alertness. Something was wrong.

“Where’s Amy?”

They fanned out through the lines of buses, calling her name. By the time Michael found her, Peter was completely frantic. He had never considered that she might wander off like this.

Michael was standing beside one of the sunken buses, peering through an open window.

“What’s she doing?” Sara said.

“I think she’s just sitting there,” said Michael.

Peter clambered up and pulled himself inside. The wind had pushed the sand to the rear of the vehicle; the first few lines of benches were exposed. Amy was sitting on the bench directly behind the driver’s seat, holding her pack on her lap. She had removed her glasses and hat.

“Amy, it’ll be dark soon. We have to go.”