Sgt. Renfrew and Constable Kelly go aloft to search for a plane missing with a shipment of gold from the Yukon Mine Company. Inventor Speavy has devised a power ray which disrupts electrical impulses, and Morgan and his gang of crooks has brought in Prof. Lewis to increase the ray's range, telling him he's helping the government develop this new weapon. Speavy spills the beans to Prof. Lewis and his daughter Madeleine,and Morgan threatens to implicate them in his crimes unless they cooperate. Morgan kills Speavy when he tries to warn Renfrew, but when Madeleine stows away on board the doomed plane Renfrew is piloting, will the crooks be able to make Prof. Lewis use the power ray to bring the plane down?
James Newill
as RCMP Sgt. Renfrew
Louise Stanley
as Madeleine Lewis
Dewey Robinson
as Uncle Dinwiddie
William Pawley
as Morgan
Joe De Stefani
as Professor Burton Lewis
Jim Farley
as Inspector Warner
Dave O'Brien
as Constable Kelly
Karl Hackett
as Hawthorne
Ted Adams
as Henchman Gary
Dwight Frye
as Speavy
Jack Rube Clifford
as Whispering Smith
Bob Terry
as Henchman Hutchins
