An American military plane takes six people, who have taken part in a NATO maneuver, from Tripoli to Oslo. Among them are the British Captain Loy and the United States Air Force Corporal Doris Graves. During the flight, the two become closer, and they regret that the trip will end that evening. But everything turns out differently. The flight captain has received orders to pick up an agent at a German NATO airport, who is to be dropped off again on a Soviet island …