The village of Turnbotham Round has had no crime for ten years. The police force consists of Sergeant Dudfoot and his two assistants, Albert and the decrepit Harbottle. After a radio interview their Chief Constable suggests that it seems unnecessary to have a police force at all and threatens an investigation. In desperation the trio decide to create an artificial 'crime wave'. They set a speed trap and arrest the Chief Constable himself and only the intervention of the Squire saves them from disaster!
Foiled, they hit on the idea of finding some smugglers. They plant a keg of brandy on the shore, to 'discover' in front of witnesses, but another keg appears! Our heroes begin to suspect that something is wrong....and for once, they're right! A real gang of smugglers is indeed in action in the area. It seems that they are guided by a light from the top of the police station! The gang is led by the Squire himself who locks our unlikely heroes in their own jail! Will they ever escape to save the day?