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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.

Director : Colbert Clark, David Howard

Writer : Wyndham Gittens, Barney A. Sarecky, Sherman L. Lowe, Al Martin, Colbert Clark, David Howard

Cast

Bob Steele

Guinn 'Big Boy' Williams

Lucile Browne

Jack Mulhall

Purnell Pratt

Robert Frazer