When the plane owned by the "Yukon and Columbia Mail Service" crashes, RCMP Sergeant Renfrew (James Newill) and Constable Kelly (Dave O'Brien) suspect murder. Their suspicions are confirmed when Renfrew finds the control stick has been jammed, forcing the plane to fly in one direction until the gas ran out. Mine owner Louise Howard (Louise Stanley) reports that her superintendent is missing. The Mounties find him murdered and that too has been made to look like an accident. A new mail service pilot, Bill Shipley (Warren Hull), arrives. He had gone to training school with Renfrew but had been cashiered for misconduct. The Mounties discover that Raymond (Karl Hackett), who had been working for Louise, really owns the flying line managed by Yuke Cardoe (William Pawley.) They find proof that all the gold from the mine isn't being turned over to Louise, and suspect that Raymond and Yuke are stealing the gold and shipping it to Seattle by plane.
James Newill
as RCMP Sgt. Renfrew
Louise Stanley
as Louise Howard
Warren Hull
as Bill Shipley
William Pawley
as Yuke Gradeau
Dave O'Brien
as Constable Kelly
George Humbert
as Nick - Cafe Owner
Karl Hackett
as Raymond - Airline Owner
Jack Rube Clifford
as Whispering Smith
Roy Barcroft
as Henchman Lodin
Bob Terry
as Henchman DeLong
Earl Douglas
as Henchman Smokie Joe
Ernie Adams
as Henry
