When Alice Bell's family are killed in a car crash, she moves in with the only family she has left, her aging maternal grandparents. Devastated, she withdraws from the world over the summer. A fresh start at a new school sees her meeting the amazing Kat, her new BFF. When Kat points out her on-again-off-again boyfriend, Frosty, and Ali locks eyes with Cole Holland; her life changes.

Drawn into Cole's bad crowd, Ali soon realises that the injuries Cole and his friends sport, and their skipping school coincides with something strange that Ali has noticed lurking around her backyard. She soon confronts Cole and learns that he and his friends are zombie slayers, and the last line of defence against the zombies hoards that plague their town. Desperate to avenge her family's deaths, Ali joins their crew, but as time passes, the zombie presence grows too. It seems that someone is looking for Ali and will do anything do find her...