 Private detective Humphrey Campbell informs his harried boss that not only has he tracked down the missing girl from his last case, but also married her. Before they can start their honeymoon, Campbell is dragged into another missing person case, which develops into a kidnapping related to a plague of bank robberies. By investigating a skein of blondes, redheads and brunettes, he invokes the suspicions of the Feds, as well as his jealous new bride.