The 49th Man

The 49th Man is a 1953 American thriller film released by Columbia Pictures, directed by Fred F. Sears and starring John Ireland, Richard Denning, Suzanne Dalbert, Peter Marshall, Robert Foulk and Mike Connors credited as Touch Conners. The Cold War thriller was based on a story by Ivan Tors and the screenplay written by Harry Essex.

After a fatal car crash in Lordsburg, New Mexico, investigators find a mysterious machine component that they turn over to the nearby Los Alamos National Laboratory for identification. Scientists there declare that it is one component of an advanced portable nuclear weapon designed by an unknown, presumably hostile power. The discovery prompts Paul Reagan Richard Denning, chief of the Security Investigation Division SID, to send agent John Williams John Ireland to investigate the source of these components and to prevent them from being assembled into a functioning weapon. As more parts are smuggled into the United States, the investigation expands and a pattern begins to emerge which points to Marseilles, France.After uranium is found welded to the hull of a U.S. Navy submarine in New London, Connecticut, Williams continues his investigation aboard that submarine, now bound for the French port, undercover as a naval officer preparing a training film. While in Marseilles, he learns that civilians Margo Wayne Suzanne Dalbert and her husband Leo Wayne Peter Marshall are working with clarinet player Buzz Olin Richard Avonde and an unknown member of the submarines crew to smuggle the parts in special metal cases built by Pierre Neff George Dee. After a fight near the dock, Williams believes that Lt. Magrew Mike Connors and Commander Jackson Robert Foulk are in on the plot. He orders them arrested, only to be betrayed by his colleague, agent Andy Robert Hunter, and taken into custody himself. ........

Source: Wikipedia