Mathias was sitting cross-legged at the bottom of the hill, facing the tree line. He didn't hear Jeff approach, or, hearing him, didn't bother to turn. Jeff sat beside him, held out the halved banana. "Lunch," he said.

Mathias took the fruit without a word. Jeff watched him begin to eat. It was Friday; Mathias and Henrich were supposed to have flown back to Germany today. Jeff and the others would've given them their E-mail addresses, their phone numbers; they would've made vague but heartfelt promises to visit. There would've been hugs in the lobby; Amy would've taken their picture. Then the four of them would've stood together at the big window, waving, as the van pulled away, bearing the two brothers toward the airport.

Jeff wiped his face on his sleeve again, worried that there might be some residue of his weeping still visible there, tear tracks down his dirt-smeared cheeks. It seemed clear that Mathias hadn't heard the vine, and Jeff was surprised by the degree of relief he felt in this. He didn't want the German to know, he realized, was frightened of his judgment.

She called me. She called my name.

The Mayans were stringing up a plastic tarp just inside the tree line-to provide some shelter from the coming storm, Jeff assumed. There were four of them working at it-three men and a woman. Two other men sat near the smoldering campfire, facing Jeff and Mathias, their bows in their laps. One of them kept blowing his nose in a dirty-looking bandanna, then holding the cloth up to examine whatever he'd expelled. Jeff leaned forward, peered left and right along the corridor of cleared ground, but he could see no sign of their leader, the bald man with the pistol on his belt. They were probably working in shifts, he supposed, some of them guarding the hill, while the others remained back at the village, tending to their fields.

"You'd think they'd just kill us," he said.

Mathias paused in his eating, turned to look at him.

"It takes so much effort, sitting here like this. Why not just slaughter us from the start and be done with it?"

"Maybe they feel it would be a sin," Mathias said.

"But they're killing us by keeping us here, aren't they? And if we tried to leave, they wouldn't hesitate to shoot us."

"That's self-defense, though, isn't it? From their perspective? Not murder."

Murder, Jeff thought. Was that what was happening here? Had Amy been murdered? And if so, by whom? The Mayans? The vine? Himself? "How long do you think it's been going on?" he asked.

"It?"

Jeff waved about them, at the hillside, the cleared ground. "The vine. Where do you think it came from?"

Mathias started in on the banana's skin, frowning slightly, thinking. Jeff waited while he chewed. There was a trio of large black birds shifting about in the trees above the Mayans' tarp. Crows, Jeff guessed. Carrion birds, drawn by the smell of Pablo or Amy, but too wise to venture any nearer. Mathias swallowed, wiped his mouth with his hand. "The mine, I guess," he said. "Don't you think? Someone must've dug it up."

"But how did they contain it? How did they have time to seal off the hill? Because they would've had to hack down all this jungle, plow the dirt with salt. Think how long that must've taken." He shook his head-it didn't seem possible.

"Maybe you're wrong about them," Mathias said. "Maybe it isn't about quarantining the vine. Maybe they know how to kill it but choose not to."

"Because?"

"Maybe it would just keep coming back. And this is a way of holding it at bay, confining it. A sort of truce they've stumbled upon."

"But if it's not about quarantining it, why won't they let us leave?"

"Maybe it's just a taboo they have among themselves, passed down through the generations, a way of ensuring that the vine never escapes its bounds. If you step into it, you can't come back. And then, when outsiders started to arrive, they simply applied the taboo to them, too." He thought about this for a moment, staring off toward the Mayans. "Or it could even be religious, right? They see the hill as sacred. And once you step on it, you can't leave. Maybe we're some sort of sacrifice."

"But if-"

"This is just us guessing, Jeff," Mathias said, sounding fatigued, a little impatient. "Just talk. It's not worth arguing about."

They sat together for a stretch, watching the crows flap from branch to branch. The wind was picking up, the storm almost upon them. The Mayans were moving their belongings back into the tree line, beneath the shelter of the tarp. Mathias was right, of course. Theorizing was pointless. The vine was here, and so were they, while the Mayans were over there. And beyond the Mayans, far out of reach, lay the rest of the world. That was all that mattered.

"What about the archaeologists?" Jeff asked.

"What about them?"

"All those people. Why hasn't someone come searching for them?"

"Maybe it's still too early. We don't know how long they've been missing. If they were supposed to be here for the summer, say, would anyone even be worried yet?"

"But you think someone will come? Eventually, if we can just hold out long enough?"

Mathias shrugged. "How many of those mounds do you guess there are? Thirty? Forty? Too many people have died here for us all simply to vanish. Sooner or later, someone's bound to find this place. I don't know when. But sooner or later."

"And you think we can last that long?"

Mathias wiped his hands on his jeans, stared down at them. His palms were burned a deep red from the vine's sap; his fingertips were cracked and bleeding. He shook his head. "Not without food."

Reflexively, Jeff began to catalog their remaining rations. The pretzels, the nuts. The two protein bars, the raisins, the handful of saltines. A can of Coke, two bottles of iced tea. All of it divided among four people-five, if Pablo ever revived enough to eat-and meant to last for…how long? Six weeks?

One of the crows dropped into the clearing, began to edge its way hesitantly toward the two men sitting by the campfire. The man with the bandanna flapped it at the bird, and the crow flew back up into the trees, cawing. Jeff stared after it.

"Maybe we could spear one of those birds," he said. "We could take a tent pole, tape the knife to it, then use some of the rope from the shaft, tie it to the bottom of the pole, like a harpoon. That way, we could throw it into the trees, then drag it back to us. All we'd have to do is figure out a way to barb the knife, so that-"

"They won't let us get close enough."

It was true, of course; Jeff could see this immediately, but he felt a brief flicker of anger nonetheless, as if Mathias were purposely thwarting him. "What if we tried to clear the hill? Just started chopping at the vine. Pulling it up. If we all-"

"There's so much of it, Jeff. And it grows so fast. How could we-"

"I'm just trying to find a way through this," Jeff said. He could hear how peevish he sounded, and he disliked himself for it.

Mathias didn't seem to notice, though. "Maybe there isn't a way," he said. "Maybe all we can do is wait and hope and endure for as long as we're able. The food will run out. Our bodies will fail. And the vine will do whatever it's going to do."

Jeff sat for a moment, examining Mathias's face. Like the rest of them, he looked shockingly depleted. The skin on his nose and forehead was beginning to peel; there was a gummy paste clinging to the corners of his mouth. His eyes were shadowed. But within this deterioration there nonetheless appeared to be some remaining reservoir of strength, which no one else, including Jeff, seemed to possess. He looked calmer than the rest of them, oddly composed, and it suddenly struck Jeff how little he actually knew about the German. He'd grown up in Munich; he'd gotten his tattoo during a brief service in the army; he was studying to become an engineer. And that was all. Mathias was generally so silent, so retiring; it was easy to convince yourself that you knew what he was thinking. But now, talking with him at such length for the first time, Jeff felt as if the German were changing moment by moment before his eyes-revealing himself-and he was proving to be far more forceful than Jeff ever would've guessed: steadier, more mature. Jeff felt small beside him, vaguely childish.