Canadian Mounties Corporal Rod Webb and Constable Mike Kelly, along with Rod's dog Chinook, are sent to the Blackfoot Crossing country to find a killer.

Mike Wein, an Alaskan bush pilot operating the the Bering Sea area, makes friends with John W. Wetherby, posing as a wealthy United States businessman. But, in reality, he is a Russian spy on his way to Siberia carrying microfilms of the United States' defense installations.

The children of feuding gangsters fall in love and fight to escape their parents' notoriety.