Mr. Topaze ('Peter Sellers' ) is an unassuming school teacher in an unassuming small French town who is honest to a fault. He is fired when he refuses to give a passing grade to a bad student, the grandson of a wealthy baroness. Castel Benac (Herbert Lom), a government official who runs a crooked financial business on the side, is persuaded by his mistress, Suzy (Nadia Gray), a......