Jenny, Jack and Justin, accompanied by Whiskers, Feathers, the ghost Gloria and the snobbish Fluffy, have set out in an effort to discover the whereabouts of the mysterious fifth key. However, Jack has been plagued by a peculiar dream, in which he saw a tree growing in a pile of bones. Despite Fluffy's sneering dismissal of this dream, Jack is convinced it is some kind of an omen, pointing to the location of the key. Inspired by this, they travel through a swamp, much to Fluffy's disapproval, and eventually find Jack's dream tree. The bones are also found to be present, thus verifying the dream to be some kind of a portent of things to come. As everyone searches for the fifth key, the bones begin to behave in a most peculiar way and disturbing way, leading to a frightening scenario of the utmost danger. It is left up to Fluffy to try to eliminate the danger and to obtain the fifth key. She eventually does so, but their victory is not assured, as an army of rats puts in a belated appearance and threatens to overwhelm them. The situation appears dire until Whiskers and Jack hatch a devious plan of escape and entrust the implication of it to Gloria. But will the plan succeed?