Based on the story by Zane Grey, this action-packed 12-part serial stars Allan Lane as Sgt. Dave King, a Canadian mounted police officer assigned to stop a gang of spies from stealing a priceless mineral they need to wage war on England. Robert Strange, Robert Kellard, Lita Conway also star. 3 1/2 hrs. Standard; Soundtrack: English Dolby Digital mono; biographies; theatrical trailers.