Dave finds a handheld computer game at the dump which involves killing zombies - his friend Zombie Katie, however, finds the game rather insulting. Exacting her revenge, Dave finds himself confronted with a group of very angry and very real zombies.

Anna is training to be a magician with Dave as her helpful assistant, but their disappearing trick is not up to much - that is, until Zombie Katie bestows a magic spell book upon them. Soon they can't stop making stuff disappear, but what will happen when there is nothing left to make disappear in Grimsby?