A would be blind hoodlum redeems himself in the Salvation Army just for a lovely lieutenant.

A student monitor in a high school in the French provinces has no control over the pupils. He is in love with the caretaker's daughter but his superior, the Dean of Discipline, is also his love rival. Now, the two men are sent on military temporary duty and irony has it that in the Army the Dean is only a private whereas the mere supervisor's rank is ... corporal!