It's Halloween and Tyler and the DG gang are left in the house under the watchful eye of the mysterious new night manager, Mimi Blunt. Tyler's begins telling a ghost story but Mimi has other ideas. As the gang are forced to clean, the discovery of a hidden diary sends them into the tale of Lady Thriftpenny, an old ghost that haunts Ashdene Ridge.

After pranking Mike, Jody's phone is locked in the safe. Their mission, should they choose to accept it, is to break in and retrieve it. Reeling from the humiliation, Mike seeks to prove he is the real prankmeister and embarks on an elaborate strategy to con the YP by adopting a heavy disguise as security specialist Gary Bradford. They begin their daring mission and Mike's scam to act as an ally to the YP nearly works until May-Li sets up her own prank to unmask Mike. Upon arriving at Ashdene Ridge, Charlie sets up wildlife cameras in the garden, but doesn't account for the company of a curious Taz.