When Mr Murphy finds out that evil organization RABID is using the Student Mind and Body competition to recruit agents, he asks Nathan, Abigail, and Mookie to form a team and enter the competition. Things go terribly wrong when Nathan's nemesis Rodney and his pals join in and start to notice some very odd things about Nathan.

Nathan has just started training for the secret organization BUM when greasy green globs of goop start oozing from every faucet in town. When BUM asks Nathan to investigate, he and his friends Abigail and Mookie follow the trail to the smelliest place they can imagine - deep in the heart of the sewers of East Craven.

When fifth-grader Nathan Abercrombie accidentally gets doused with an experimental serum, he becomes a half-dead zombie - and discovers that being half-dead isn't all bad. He doesn't feel any pain, so there's no need to worry about Rodney the bully anymore. Still, Nathan would rather be human. Will he find a cure