Josef Vadassy a Hungarian refugee & language teacher living in France is enjoying his first break for years in a small hotel on the Riviera. But when he takes his holiday photographs to be developed at a local chemists he suddenly finds himself mistaken for a Gestapo agent & a charge of espionage is levelled at him. To prove himself innocent to the French police he must discover which one of his fellow guests at his pension is the real spy. As he desperately tries to uncover the true culprit's identity Vadassy must risk his job his safety & everything he holds dear.