[2]Sergeant Renfrew (James Newill) of the Royal Canadian Mounted Police and Constable Kelly (Dave O'Brien) fly in search of a missing aircraft flown by Buzz Murphy (Eddie Featherston).

Local radio announcer Uncle Dimwittie (Dewey Robinson), has bugged the mine office, and is secretly transmitting information about gold shipments, in the guise of reading children's stories on the air.

They have forced Professor Lewis (Joe De Stefani) to work on a powerful ray gun invented by a scientist named Speavy (Dwight Frye).

Phil Goldstone of Criterion Pictures produced the film, released theatrically in April 1940, and would later be re-released for additional box office by Monogram Studios.

In 1951, this movie would be edited into a 25-minute television episode for a weekly Renfrew of the Mounted series, with James Newill reprising his role for newly-filmed opening and closing.