Policeman Frank Murphy experiences an asthma attack while trying to apprehend a youth named Lucas and his dog. In a perplexing decision, the judge makes Murphy the boy's guardian.

Frank is excited about his undercover assignment until he learns he must be disguised as an elderly woman.

Lucas is unjustly arrested for shoplifting. A broken-hearted Frank is too upset to accept Lucas's explanation, so the youngster packs his bags and runs away with his dog.