Butterbean is bored. She and the other pets pulled off a heist once, but that was like a million years ago. Nothing exciting has happened since then. That is, until Mrs. Third Floor shows up at their apartment, convinced there's a ghost in the building.

Mrs. Third Floor's rental unit is showing signs of paranormal activity--eerie noises, objects moving when no one is there, fish disappearing from the tank overnight. The pets decide to investigate. Soon they're confronted with a bigger problem than just ghosts: professional ghost hunters who are offering to drive out the spirits for a hefty fee. It's up to Butterbean and the rest of the gang to save Mrs. Third Floor from losing her life savings to scammers, all while dealing with some really annoying new animals. Can the furry friends uncover the truth in time?