Asger and Petra’s father recently passed away, and Halloween was their special tradition together. This year Asger wants to stay home, Esther wants to go to a party, and Petra wants to continue the tradition of trick-or-treating. Unable to go by herself, their parents force them to celebrate together. But Petra disappears without a trace. Meanwhile, burglars are roaming the town stalking for the next house. They encounter Petra and a game of cat and mouse begins. Asger and Esther must overcome all obstacles on Halloween night to find Petra and return home safely.