Adventure fills the skies in "Sky Bandits" (1940), the final entry in the "Renfrew of the Mounties" series. When cargo planes carrying gold shipments begin disappearing, Sergeant Renfrew of the Royal Canadian Mounted Police discovers that a gang of criminals - with the help of a coerced scientist - has perfected a ray gun capable of crippling and bringing down planes. It's up to Renfrew to stop the criminals before they hold the world hostage with their deadly weapon. With its high adventure and breathless cliffhangers, "Sky Bandits" is a delightful curtain call to one of the 1930's most durable series.