Passed | | Action, Adventure
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.
It is possible that the man portraying the Black Ace in full costume is not Jack Mulhall but actually a stuntman.
When Mystery Squadron bad guy Roberts is shot dead while shooting a flame-thrower from his plane, he falls halfway out of the cockpit and hangs there motionless. Despite the fact that apparently no one is piloting the craft, it manages to make a perfect three-point landing and come to a halt all by itself.