Set in Elizabethan times, the stooges help their friend Cedric the Blacksmith win the hand of the fair princess Elaine. The only problem is that Elaine is promised to the Black Prince who is plotting to take over the kingdom. The stooges manage to foil the plot and the grateful King allows Cedric to marry Elaine.

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.