Hank Davis, foreman on a huge dam project, enlists the aid of his two flyer friends when a sinister figure known as The Black Ace leads his Mystery Squadron of masked pilots in an attempt to destroy the dam.
Bob Steele
Guinn "Big Boy" Williams
Lucile Browne
Jack Mulhall
Purnell Pratt
Robert Frazer
J. Carrol Naish
Bob Kortman
Lafe McKee
Edward Hearn
Kernan Cripps
Edward Peil Sr.
Jack Mower
Jack Perrin
