Things begin disappearing mysteriously throughout Ravenville. Brady discovers that a mischievous Pooka is responsible, but nobody can see it except the family dog, Boris. The invisible Pooka is a prankster who loves creating conflict by taking or switching people's property. Soon enough all of Ravenville's citizens are fighting each other, unaware that the Pooka is responsible for their misplaced stuff. Using specially tinted glasses and help from Boris and Virgil, they find the Pooka and put an end to his trouble-making by matching him up with the Minotaur.
