A gang of Confederate agents are stealing gold shipments bound for Washington. Government agent Steve Clark (Dennis Moore) is sent across to California to investigate, helped by Wells Fargo agent Idaho Jones (Joe Sawyer).
In fact, the real mastermind behind the theft is Morel (Lionel Atwill) who isn't operating for the Confederacy after all but rather a group of Prussian spies...
A great serial with a good variety of cliff hangers including runaway train cars and burning sheds! The inclusion of Prussian spies was likely to give the serial a bit of a wartime propaganda edge but works well, Atwill and his accomplice Virginia Christine make an excellent pair of villains which gives the serial the bite the slightly bland heroes cannot.