Dave King of the Mounties, with Peggy Drake as heroine Carol Brent, and Abner Biberman played the villainous Japanese admiral Yamata.

The identity of the plane remains a mystery until Professor Marshall Brent and his daughter Carol arrive with a new type of airplane detector.

RCMP Sergeant Dave King attempts a rescue, but the professor is killed when the plane in which he is held captive crashes into a riverboat.

When the spy ring makes a last desperate attempt to capture the device from the cabin in which she is hiding out, she destroys it rather than let it fall into enemy hands.

However, the serial was recently restored by SerialSquadron.com, with added sound as well as subtitles in the spots where the soundtrack was missing.