Twelve-year-old Gavin Baker, son of a warrior, is a born worrier. With his father serving overseas, Gavin assumes that he's already imagined the worst that can happen-- until he shakes hands with his best friend Javi's long-lost grandfather and finds himself trapped in the old magician's ailing body. Help! As the trickster takes over Gavin's life, fooling the girl of his dreams and even his own family, Gavin wonders if the imposter is a better version...