Harry Crumb is a bumbling and inept private investigator who is hired to solve the kidnapping of a young heiress which he's not expected to solve because his employer is the mastermind behind the kidnapping.
Clifford is a ten-year-old troublemaker, who puts not only his parents through hell, but also his uncle with whom his parents have discarded him to.
By means of an accident the soul of David and his swinging grandfather get swapped. While the grandfather's body is still in coma, he enjoys having a young body again and repairs some facts...