She tried another route. “If there were toxic levels of radiation, all the Earthborns would be dead.”

“Not if they evolved to be immune to it, or something.”

Clarke had no answer for that. She was desperate to ask Sasha more about the other Colonists, the ones who’d come a year ago. A theory had been percolating in her mind ever since she stumbled across the wreckage. The bits of metal were the missing link, she was sure of it. She just needed to find out more. “Don’t worry,” she said, placing her hand on Eric’s shoulder. “We’re going to figure this out. They’re going to be okay. Can you and Priya just keep an eye on everyone for a little bit? I’ll be right back.”

Eric nodded, then slid to the ground next to Felix’s cot with a sigh. Priya watched him for a moment, then sat beside him and gave his arm a squeeze. “Go ahead, Clarke. We’ll be fine.”

Clarke squinted as she stepped into the sunlight. The pain in her arm was mostly gone, and her head was clear for the first time in days. But while she felt better physically than she had since the snakebite, anxiety pooled in her stomach as she searched for Sasha. Had she somehow managed to escape under Wells’s watch? Or worse, had Graham and his buddies taken her somewhere?

She scanned the clearing, which was abuzz with activity, most of which revolved around the new cabin. A bunch of people were dragging huge pieces of wood toward the new site, while others carved notches into smaller logs so they’d fit together. A few of the older boys had begun to roll the largest logs into the ditches they’d dug for the foundation. Bellamy was among them.

He had taken off his shirt, and his skin was slick with sweat. Even from a distance, Clarke could see his back muscles contracting as he used all his weight to drag the log into position.

A curly-haired girl approached him, trailed by two giggling friends. This trio had taken the cutoffs trend to the extreme, and were now tugging at the frayed edges of shorts that barely skimmed the tops of their thighs. “Hey,” the first girl said. “We need a tall person to help us fix the roof on the north cabin. It’s caving in already.”

Bellamy barely glanced at her. “Build a ladder.”

Clarke suppressed a laugh as a shadow of irritation flitted across the girl’s face before she resumed her coy smile. “Can you show us how?”

Bellamy looked over his shoulder and made a beckoning motion. “Hey, Antonio. Get over here.” A short, stocky kid with acne and a good-natured smile came jogging over. “These ladies need help with the cabin. Can you give them a hand?”

“With pleasure,” Antonio said, his eyes widening as he looked from Bellamy to the girls, who were trying, with various degrees of success, to hide their disappointment.

Clarke smiled to herself, secretly pleased by how little interest Bellamy demonstrated toward the other, very pretty girls. He was so cocky, and so charming when the mood struck him that it was hard to believe he’d only ever had one girlfriend.

It was even harder to believe that that girlfriend was the person whose face Clarke saw every night before she went to sleep. Whose voice she could still hear when everything was quiet.

She shook her head and started toward Bellamy. “Such a gentleman,” she teased, watching the girls trudge off with a visibly elated Antonio.

“Well, hello there.” Bellamy pulled her into a hug. “How are you feeling?”

“Like I need to shower.” Clarke pushed Bellamy away, laughing. “Now I have your sweat all over me.”

“Well, consider it payback for when I carried you six kilometers while you were unconscious. I didn’t know it was possible for a human being to drool that much without dying of dehydration.”

“I didn’t drool on you,” Clarke protested.

“How do you know? You were passed out. Unless…” He narrowed his eyes and looked thoughtful. “Unless you just faked the whole snakebite thing so you wouldn’t have to walk anymore. That would be pretty crafty.”

Clarke just smiled. “Do you know where Sasha went?” she asked.

Bellamy’s face hardened. “I think Wells might’ve taken her somewhere. They’ve both been missing for hours.” He shook his head. “The idiot.”

“Oh,” Clarke said, trying her best to keep her voice neutral. There was no reason for her to care that Wells had gone off with Sasha. He had just as much right to talk to her as Clarke did. But for some reason, the idea of them alone in the woods made her uncomfortable.

“Yeah, I know,” Bellamy said, mistaking her surprise for disapproval. “I don’t know what the hell he was thinking. I can’t force her to help me find Octavia, but Wells can go off on a picnic with her. Makes sense.”

“Listen, will you come with me? I want to go back and look at that wreckage we found.”

Bellamy frowned. “I’m not sure that’s a good idea.”

“We’ll be on the lookout for the Earthborns. It’ll be fine,” she said.

“It’s just… I don’t want to stray too far from camp, in case Octavia comes back. I don’t want to miss her.”

Clarke nodded guiltily. Here she was, caught up with her ridiculous theory, when Bellamy still didn’t know where his sister was or if she was even alive. When her campmates might be dying in the infirmary cabin, and she had pills that could possibly save their lives. “You’re right. I’ll go by myself.”

“What?” Bellamy shook his head. “No way. I’d rather cover myself in Graham’s drool than let you go out there on your own.”

“Let me?” Clarke repeated. “I’m sorry. Last time I checked, no one was in charge of me.”

“You know what I mean. I’m just worried about you.”

“I’ll be fine.”

“Yeah, I know you’ll be fine, because I’m coming with you.”

“Okay,” Clarke said, forcing herself to sound more annoyed than she felt. She knew Bellamy wasn’t trying to control her. He cared about her, and the thought brought a flush to her cheeks.

They slipped away without telling anyone where they were going, and a few minutes later, were deep in the stillness of the woods. They walked mostly in silence, both of them relieved to escape the constant questioning of their needy campmates. But after nearly an hour, a prickle of concern prompted Clarke to speak.

“Are you sure this is the right way?” she asked, after they passed a moss-covered rock for what seemed to be the second time.

“Positive. There’s the spot where I almost dropped you,” he said, pointing vaguely into the distance. “That’s where I stopped to make sure you weren’t choking on your own vomit. And, oh, look, that’s where you regained consciousness for a few seconds and told me that I had the biggest—” He cut himself off with a yelp as Clarke jabbed him in the stomach with her elbow.

Bellamy laughed, but then something in the distance caught his attention, and his face turned serious. “I think we’re close.”

Clarke nodded and began scanning the ground for anything metallic. She was determined to figure out what the wreckage was from. A dropship? A shelter the first Colonists had built?

But instead of the glint of metal, her eyes settled on a series of shapes that sent her heart rushing into her throat.

Three large stones stuck out of the ground. They might’ve once been straight, but now two were tilted toward each other, while a third teetered precariously away from the group. They were approximately the same size, and there was no mistaking that they’d been placed there on purpose. Even from a distance, Clarke could make out crude markings on the stones—letters, hastily carved with inadequate tools. Or, Clarke realized as she deciphered the shapes, carved by someone shaking with fear and grief.

REST IN PEACE.

Clarke had never heard the words spoken aloud, but she could feel them in her chest, as if the memory was stored somewhere inside her bones. Her hand reached out for Bellamy’s, but her fingers grasped nothing but air.

She turned and saw him crouching in front of one of the markers. She walked over and placed her hand on his shoulder. “They’re graves,” he said quietly, without looking at her.