On Halloween, estranged friends Asger and Esther must work together to rescue Asger's kidnapped sister Petra, while Petra battles the thieves that took her.

Siblings Asger and Petra have recently lost their father; this is their first Halloween without him. Asger and neighbor girl Esther have drifted apart, but are forced to celebrate Halloween with their families. But when Petra suddenly disappears without a trace, Asger and Esther work together to find the missing little girl. They head out into the Halloween night, and in their frantic search for Petra, they encounter the boy Svend, disguised zombies, thieves, and all sorts of challenges, before ending up in front of the spooky house where the evil witch lives. Can they find Petra in time?