The Rocinantehad begun its life as an escort corvette on the battleship Donnager. It was well designed and well constructed, but also now years past its last upgrade. The weaknesses in its defense were simple: The cargo doors nearest the reactor had been damaged and repaired, and would almost certainly be weaker than the original. The forward airlock had been built with a software glitch vulnerable to hacking; real Martian naval ships would have been updated as a matter of course, but Holden might have been sloppy.

Her first hope was the airlock. A short-range access transmitter built for troubleshooting malfunctioning airlocks had found its way in among her things. If that failed, getting through the cargo door was harder. She hoped for something explosive, but the Thomas Princetook its munitions very seriously. The equipment manifests did include a half-suit exoskeleton mech. It would fit over her chest and arms—it wasn’t designed for legs—and with a cutting torch to make the initial breach, it could probably bend the plating enough to let her through. It was also small and lightweight enough to carry, and her access card was a high enough grade for the system to let her take one away.

Once she was on, it would be simple. Kill everyone, overload the reactor, and blow the ship to atoms. With any luck at all, it would reignite suspicions about the bomb on the Seung Un. If she got out, fine. If she didn’t, she didn’t.

The only tricks now were getting there, and waiting like everyone else to hear what happened on the station.

She was dreaming when catastrophe came.

In it, she was walking through a field outside a schoolhouse. She knew that it was on fire, that she had to find a way in. She heard fire engine sirens, but their dark shapes never appeared in the sky. There were people trapped inside and she was supposed to get to them. To free them or to keep them from escaping or both.

She was on the roof, going down through a hole. Smoke billowed out around her, but she could still breathe because she’d been immunized against flames. She stretched down, fingertips brushing against low-g handholds. She realized someone was holding her wrist, supporting her as she strained in toward the darkness and fire. Ren. She couldn’t look at him. Sorrow and guilt welled up in her like a flood and she collapsed into a blue-lit bar with crash couches where all the tables should have been. Couples ate dinner and talked and screwed in the dim around her. The man across from her was both Holden and her father. She tried to speak, to say that she didn’t want to do this. The man took her by the shoulders, pressing her into the soft gel. She was afraid for a moment that he’d crawl on top of her, but he brought his fists down on her chest with a killing impact and she woke up to the sound of Klaxons and droplets of blood floating in the air.

The pain in her body was so profound and inexplicable that it didn’t feel like pain; it was only the sense that something was wrong. She coughed, launching a spray of blood across the room. She thought that somehow she’d triggered her false glands in her sleep, that what was wrong was only her, but the ship alarms argued that it was something worse. She reached for her hand terminal, but it wasn’t in its holder. She found it floating half a meter from the door, rotating in the air. A star-shaped fracture in the resin case showed where it had hit something hard enough to break. The network access displayed a bright red bar. No status. System down.

Melba pulled herself to the door and cycled it open.

The dead woman floating in the corridor had her arms out before her, her hair splayed around her like someone drowned. The left side of her face was oddly shaped, softer and rounder and bluer than it should have been. Her eyes were half open, the whites the bright red of burst vessels. Melba pushed past the corpse. Farther down the corridor, a sphere of blood the size of a soccer ball floated slowly toward the air intake with no sign where it had come from.

In the wider corridors toward the middle of the ship, things were worse. Bodies floated at every door, in every passageway. Everything not bolted down floated now by the walls, thrown toward the bow. The soft gray walls were covered with dents where hand terminals and tools and heads had struck them. The air smelled like blood and something else, deeper and more intimate.

Outside the commissary, three soldiers were using sealant foam to stick the dead to the walls, keeping them out of the way. In gravity, they would have been stacking bodies like cordwood.

“You all right?” one of them said. It took Melba a second to realize that the woman was speaking to her.

“I’m okay,” Melba said. “What happened?”

“Who the fuck knows? You’re one of the maintenance techs, yes?” the woman said sharply.

“I am,” Melba said. “Melba Koh. Electrochemical.”

“Well, you can get your ass to environmental, Koh,” the woman said. “I’m guessing they need you there.”

Melba nodded, the motion sending her spinning a little until the woman put out a hand to steady her.

She’d never been in a battle or at the scene of a natural disaster. The nearest had been a hurricane that hit São Paulo when she was eight, and her father had hidden the family in the corporate shelters until the flooding was gone. She’d seen more of that damage on the newsfeeds than in person. The Thomas Princewas a scene from hell. She passed knots of people working frantically, but the dead and dying were everywhere. Droplets of blood and chips of shattered plastic formed clouds where the eddies of the recyclers pushed them together. In zero g, blood pooled in the wounds and wouldn’t clear. Inflammation was worse. Lungs filled with fluid more easily. However many had died already, more would. Soon. If she hadn’t been in her crash couch, she’d have been thrown into a wall at six hundred meters per second, just like all the others. No, that couldn’t be right. No one would have survived that.

She hadn’t spent much of her time on environmental decks. Most of her work before with Stanni and Soledad had been with power routing. The air and water systems had technicians of their own, specialists at a higher pay grade than hers. The architecture of the rooms kept everything close without being as cramped as the Cerisier. She floated in with a sense of relief, as if reaching her goal accomplished something in itself. As if it gave her some measure of control.

The air smelled of ozone and burned hair. A young man, face covered with blue-black bruises, was stuck to the bulkhead with a rope and two electromagnets. He waved something similar to a broom with a massive mesh of fabric on the end like a gigantic fly swatter. Clearing blood from the air. His damaged face was impassive, shocked. A thickening layer of tears encased his eyes, blinding him.

“You! Who the hell are you?”

Melba turned. The new man wore a navy uniform. His right leg was in an inflatable pressure cast. The foot sticking out the end was a bluish purple, and his breath was labored in a way that made her think of pneumonia, of internal bleeding.

“Melba Koh. Civilian electrochemical tech off the Cerisier.”

“Who do you answer to?”

“Mikelson’s my group supervisor,” she said, struggling to remember the man’s name. She had only met him once, and he hadn’t left much of an impression on her.

“My name’s Nikos,” the broken-legged man said. “You work for me now. Come on.”

He pushed off more gracefully than should have been possible. She followed him a little too fast and had to grab a handhold to keep from running into his back. He led her through a long passageway into engineering. A huge array of thin metal and ceramic sheets stood at one wall, warnings in eight languages printed along its side. Scorch marks drew circles on the outermost plate, and the air stank of burnt plastic and something else. A hole two feet across had been punched through the center. A human body was still in it, held in place by shards of metal.