In Scotland, Gallagher meets with Major General Hardy about a Ranger mission and Gallagher comes up with an air support plan. Returning from Scotland via an Air Transport B-17, they are shot down over the North Sea. Of the two man crew, Captain Tom Powell, and Staff Sergeant Johnny Miller only Powell survives along with Gallagher. They put up the radio transmitter, no luck. They find an island (Seagull Rock) to land on. A B-17 Weather Plane hears them and so does a fishing trawler. So too does a German U-Boat. Gallagher ditches his briefcase. Powell surrenders, Gallagher gets captured, and they get taken to the U-Boat. They are treated with surprising decency by the U-Boat commander -- but the Nazi turns out to have a sinister hidden motive.

A dishonorably discharged flier (James Franciscus) masquerades as a replacement pilot in order to fly one combat mission.