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.

• Mascot Pictures
• Bob Steele
• Guinn "Big Boy" Williams
• Lucile Browne
• Jack Mulhall
• Purnell Pratt
• Robert Frazer
• J. Carrol Naish
• Bob Kortman