Legions of the Death Master — Frederick C. Davis

Like the tentacles of a gigantic and loathsome octopus the ends of that infamous international espionage ring had stretched out across the United States. Lusting for power, the fiendish leader of that ring was stripping the country of its entire armaments; butchering, in the very capital of the nation, the patriots who pleaded for adequate war-strength. Operator 5, America's Secret Service Ace, tried to oppose that ruthless Death Master-but Jimmy Christopher fought a power that scattered his own helpers, crippled the Intelligence, and threatened invasions that would have spelled utter annihilation!