The stooges are private detectives hired to find a missing girl. The boys disguise as pie salesmen and end up wandering around a mad scientist's mansion, trying to find the girl. The boys confront a gorilla and various other bad guys, before rescuing the girl.

After the suspicious suicide of a fellow cop, tough homicide detective Dave Bannion takes the law into his own hands when he sets out to smash a vicious crime syndicate.