Nathan Abercrombie is getting used to his rotten life as a half-dead zombie. The good thing is he doesn't feel any pain. The bad thing is his body can't heal, so he has to be really careful not to break anything. But that's hard to do when his wrestling-obsessed gym teacher, Mr. Lomux, matches him up with Rodney the bully, who's looking for any excuse to break his bones. Then one day, Nathan is approached by the secret organization B.U.M.—aka the Bureau of Useful Misadventures—which offers him a cure in exchange for his help. Nathan jumps at the chance to become the world's first zombie spy, but soon discovers that B.U.M. isn't quite what it seems. Can Nathan trust them?