Academy Award winner James Cagney stars with Alan Hale and Dennis Morgan as a hot-shot Canadian pilot who enlists in the Royal Canadian Air Force, becoming one of the Captains of the Clouds. World War II. Pilot Brian MacLean (Cagney--Yankee Doodle Dandy, Mr. Roberts) is just as adept at stealing flying jobs from his competition as he is at stealing their girlfriend's hearts. But when he hears a speech by British Prime Minister Winston Churchill about the looming Nazi threat, MacLean enlists in the Canadian Air Force . . . only to find his superior is a man from whom he stole both a job and a girl--and to encounter action and adventure in aerial combat over the North Atlantic.