Undercover agent Robert Leyland entraps crooks trying to sneak expensive goods past customs on transatlantic crossings. After Leyland falls for reluctant smuggler Barbara Standish, he convinces her to return with him to France with her cache of diamonds. But she is unaware of a network of thieves...
A young riveter working high up on a steel girder watches a girl practising a tap-dance in a building opposite, and while applauding her, he loses his balance and falls.
James Mason is teamed up once again with Virginia Cherill whom he appeared with in his debut film, 'Late Extra'. He plays a government agent (John Merriman) who makes a few enquiries and follows leads. Cherill plays June Elkhardt.
