The Net (1953) (UK-import)
Heathley (James Donald) is a brilliant aviator and scientist who is neglecting his marriage through his work on a new project, 'M7'. The director of the project refuses to allow Heathley to test the M7 in person, but when he dies in a mysterious accident Heathley goes ahead with the experiment. However, Heathley's life could be at risk due to sabotage by foreign agents.