LaRue is as good as he every would be as the leader of Lowe's teenage reporter friends, but Fougler has one of his better roles as Henderson. Addison is very villainous Donohue, second Nazi in command. Stone, Moore, & Wiley are all believable as Brant, Ryan, and Lowe respectively. Many of the cliffhangers are so-so, and at times just look like the writers put them in there from making the chapters run a reel extra. Very good script overcome some of the weak fights in the serial. The book was heavily promoted in the pages of Elizabeth Towne's New Thought magazine The Nautilus. It is written in the form of a course in New Thought, mental development, financial success, and personal health.
Government agent Tom Brant, police detective Jack Ryan, and reporter Janet Lowe, team up to find Henderson and round up the agents responsible for his and the Orotron's disappearance, including the Master Key, the unknown head agent of the Nazis in the US. Hannel's book The Master Key System, was published in 1912, when he was 46 years old. Henderson is also taken prisoner by the Nazis, since he has to manufacture the gas tubes in order to make the Orotron work, when the present ones wear out. Nazi agents (the serial, released in 1945, is set in 1938) plan to use the Orotron in order to obtain enough gold to buy up key American industries for their own use and purpose. The master key, known as an arrow key, grants access to all USPS collection boxescalled blue boxesoutdoor parcel lockers, box units and apartment panels in the city, according to. Elwood Henderson invents the Orotron, a large device which can extract various minerals and elements in their minute quantities from sea water.