Nathan Gregory is a World War I veteran pilot who runs a small, debt-ridden traveling carnival along with loyal daughter Jean. Gregory is at odds with five of his former squadron comrades, who he thinks shot him down in 1918 and stole his plans for an incredible invention, a radio=piloted plane. An enigmatic criminal, called "The Eagle", and his gang of toughs skywrites threate...
Chapter 1, "The Black Ace" opens with dam-project foreman Hank Davis hiring two stunt flyers he once flew with, Fred Cromell and Bill "Jellybean" Cook, to protect the dam from the air raids by a group known as the Mystery Squadron, under the leadership of the mysterious Black Ace. Each attack is preceded by the arrival of a miniature airplane carrying a warning that the Mystery...
When Lt. Wild Bill Traynor, bad boy of the Marine Corps, arrives at a San Diego Marine Base, he is surprised to discover he has been assigned to duty under his old rival, Captain Benton (Conrad Nagel). While eluding the advances of Rosita (Armida), a Latin dancer, Bill becomes involved with Bentons fiancee, Dorothy Manning (Esther Ralston), whom he quickly wins and Benton acc...
