Dying isn’t any fun…but at least it’s a living. Mickey7 is an Expendable: a disposable employee on a human expedition sent to colonize the ice world Niflheim. Whenever there’s a mission that’s too dangerous—even suicidal—the crew turns to Mickey. After one iteration dies, a new body is regenerated with most of his memories intact. After six deaths, Mickey7 understands the terms of his deal…and why it was the only colonial position unfilled when he took it. On a fairly routine scouting mission, Mickey7 goes missing and is presumed dead. By the time he returns to the colony base, surprisingly helped back by native life, Mickey7’s fate has been sealed. There’s a new clone, Mickey8, reporting for Expendable duties. The idea of duplicate Expendables is universally loathed, and if caught, they will likely be thrown into the recycler for protein. Mickey7 must keep his double a secret from the rest of the colony. Meanwhile, life on Niflheim is getting worse. The atmosphere is unsuitable for humans, food is in short supply, and terraforming is going poorly. The native species are growing curious about their new neighbors, and that curiosity has Commander Marshall very afraid. Ultimately, the survival of both lifeforms will come down to Mickey7. That is, if he can just keep from dying for good.

Summer has come to Niflheim. The lichens are growing, the six-winged bat-things are chirping, and much to his own surprise, Mickey Barnes is still alive―that last part thanks almost entirely to the fact that Commander Marshall believes that the colony’s creeper neighbors are holding an antimatter bomb, and that Mickey is the only one who’s keeping them from using it. Mickey’s just another colonist now. Instead of cleaning out the reactor core, he spends his time these days cleaning out the rabbit hutches. It’s not a bad life. It’s not going to last. It may be sunny now, but winter is coming. The antimatter that fuels the colony is running low, and Marshall wants his bomb back. If Mickey agrees to retrieve it, he’ll be giving up the only thing that’s kept his head off of the chopping block. If he refuses, he might doom the entire colony. Meanwhile, the creepers have their own worries, and they’re not going to surrender the bomb without getting something in return. Once again, Mickey finds the fate of two species resting in his hands. If something goes wrong this time, though, he won’t be coming back.