Would be detectives, the stooges get a job guarding a Scotch castle while the owner is away. The servants are crooks intent on robbing the castle of its valuables. Though they do their best to frighten the boys off, the stooges prevail and expose the crooked goings-on.
The Stooges witness an armed robbery and are brought in by the cops as suspects. After passing a lie detector test, the boys are freed and go back to their jobs in a cafe. When one of the robbers comes into the cafe, the boys recognize him and along with their friend Gladys trail him to a spooky house in the country where the crooks are hiding out. The bad guys abduct Gladys and the Stooges must rescue her.
The stooges are the trainers of "Chopper", a beefy boxer, and they bet their bankroll on Chopper to win his next fight. When "Big Mike", their boss, tells them to have Chopper lose or they'll lose their lives, the boys try to soften up Chopper so he'll lose. The fight gets canceled and the stooges have to contend with an angry Big Mike and his goons.
