The Coolsville police station is being haunted by a monstrous mobster and his ghostly goons! Is it a cover for a jailbreak? A distraction to keep the police too busy to stop a daring crime elsewhere in the city? Or could the monsters be real? It's up to Scooby and the gang to unravel the clues and crack the mystery-that is, if they can ever get out of the cell they've accidentally locked themselves in!