Matt Brennan runs into Jo Holloway, the Red Cross girl he romanced in Europe when he was a flyer in World War II, when he is offered a job by jet manufacturer Leland Willis as a test pilot. Carl Troxell, wants to sell an escape cockpit to the Air Force. He wants Matt to stall the presentation of JA-3 the prototype that doesn't include the ejection seat, to give him more time for the experimental JA-4. But Matt doesn't believe it is yet safe enough to try.