He had to get help. His gaze drifted to the list of children’s names. He had to get help, but first he’d check, just check. He’d go to… go to…

He closed his eyes, frowned. He knew the answer. He knew that he knew. The security station. He’d go there and ask about each of them. He opened his eyes, writing security station down under the list, capturing the thought. Then UN outreach station. Mars outreach. All the places he’d been before, day after day, only now with new questions. It would be easy. And then, when he knew, there was something else he was supposed to do. It took a minute to figure out what it was, and then he wrote it at the bottom of the page.

Get help.

“They’re all gone,” Prax said, his breath ghosting white in the cold. “They’re all his patients, and they’re all gone. Sixteen out of sixteen. Do you know the probability of that? It’s not random.”

The security man hadn’t shaved in days. A long, angry ice burn reddened his cheek and neck, the wound fresh and untreated. His face must have touched an uninsulated piece of Ganymede. He was lucky to still have skin. He wore a thick coat and gloves. There was frost on the desk.

“I appreciate the information, sir, and I’ll see it gets out to the relief stations — ”

“No, you don’t understand, he took them. They’re sick, and he took them.”

“Maybe he was trying to keep them safe,” the security man said. His voice was a gray rag, limp and weary. There was a problem with that. Prax knew there was a problem with that, but he couldn’t remember what it was. The security man reached out, gently moving him aside, and nodded to the woman behind him. Prax found himself staring at her like he was drunk.

“I want to report a murder,” she said, her voice shaking.