It's Halloween, and scary thoughts are in the air. Josh plans a moneymaking ghost tour with the help of Pete and Frankie, and persuades Frankie to dress up as the ghost of a girl and haunt the school corridors. He even enlists Brian's help to appear as a scary rat and make creepy noises. Meanwhile, back at the house Lucy, Mel and Sophie are all forced to face their fears as things begin to get really frightening. Brian's involvement with Josh's ghost tour has made him fear that there really are ghosts out there, and when his zombie-eliminator gun goes wrong Brian manages to turn himself into the biggest monster in town, scaring all the guests at a Halloween party. And when all the lights in the house fuse Lucy has to confront her fear of the dark and save the family by venturing out alone into the scary dark attic.