An American CIA agent must find the whereabouts of valuable microfilm that was smuggled over by two Russian scientists who had been hoping to defect.

Suave antiques dealer Alfredo Martelli is picked up by the police with no justification. At the precinct, Martelli realizes what the investigation is all about-- that he is the main suspect in the killing of his wealthy ex-lover. Is he guilty, or is he just a sleaze?