During the Korean War, scientist Dean Olmstead (Joseph Hamilton) designs a long-range radio transmitting and tracking device for the United States Air Force. During testing of the device, Capt. Tom Arnett (John Agar), leading an escort of North American F-86 Sabre jet fighters, is unable to prevent Olmstead's North American B-25 Mitchell bomber being shot down in North Korea. His commanding officer, Col. Catlett (George Cisar (actor)) plans a rescue of the scientist, whom he believes is still alive and may be undergoing interrogation by Main Intelligence Directorate (Soviet Union) working with the North Koreans.