A disgraced school master, Benjamin Twist, is mistaken for a tough prison governor and assigned the charge of a prison for particularly hardened criminals. Believing he is being sent to a school rather than a prison, he celebrates accordingly only to find that his drunkenness accidently lands him on the wrong side of the prison bars. The Governorship is eventually restored to him, and he sets about popularising himself amongst the convicts by turning a blind eye to their shady dealings.

George Shuttleworth is convinced that he has the talent to win the Isle of Man TT races, despite what his neighbours back home in Wigan may think. During the trials, the brakes go on George's bike, 'The Shuttleworth Snap', which he made himself. As a result, he breaks the TT lap record, becoming an instant motor-cycling star. As the big race approaches, George soon realises that other jealous riders will stop at nothing to make sure he does not take part in the race. An early George Formby film and probably his best.