Follow that ferret! Abbi and her friends and family are pet-sitting at a petting zoo and animal sanctuary. The kids are in charge of the ferret, Marcie. There's just one problem: Marcie is acting very strange. She seems upset! Then she runs off, escaping her crate, and sending Abbi, Lydia, and Daniel on a hunt for the missing ferret! Little do they know that finding Marcie will lead to an even bigger mystery. . . .