A group of survivors from all walks of the apocalypse – an idiotic Sheriff with definite coma-induced brain damage, his hardass son and a hobo with only a crossbow to stave off the walking dead, four squabbling friends forced to survive this zombieland together, and a lonely zombie who just needs love to fully regain his warm body – leave their once-safe mall hideout in search of the rumored Safe Haven Ranch, a refuge untouched by the zombie virus that has ravaged humanity.

After a day of teenage shenanigans, high school best friends Lucy, Kat, and Peter find themselves breaking into an abandoned house for fun. Inside, Peter discovers an ancient book with the words "Quomodo si vocare daemones" (Translation: How to Summon Demons) on the front. Days later, during gym class, Lucy begins to suspect that Peter is in fact possessed by a demon. In a search for answers, Lucy and Kat venture back to the abandoned house in hopes of finding the book and reversing whatever effects it has had on their friend. Along the way, the duo must try to survive encounters with segway riding school bullies, Demon Peter himself, and a local drug lord.