I Was a Sixth Grade Zombie is a novella written by R. L. Stine and Nina Kiriki Hoffman. It was first published in 1998 and is the thirtieth book in the Ghosts of Fear Street book series.
Description[]
Every kid in Valerie Martin's class has joined a mysterious after-school club, but they can't remember a thing about it. Val begins to investigate and when she uncovers the truth, she may be the next to lose her mind.