A group of bitter men—a secret League of War—was ready to plunge the world into a new, earth-wide conflict. They issued orders, and bloody organized murder was loosed in the heart of Europe! And behind this carnage, a single man was scheming to make himself the Dictator of the World! Never before had a single person conceived such a colossal plan for profiting from the slaughter of humans. He had overcome all obstacles—except one lone avenger, Operator 5, America’s secret service ace. Can Jimmy Christopher keep the nations of the world from hurling themselves into a war which can bring nothing but universal defeat, misery, and slavery?
Henry Steeger, the owner of pulp publisher Popular Publications, launched the monthly pulp magazine "Operator #5," about a hero who would "single-handedly, or almost, save the nation from complete destruction regularly every month," in 1934. The novels were published under the pseudonym Curtis Steele, and were written by Frederick C. Davis until November 1935, then by Emile C. Tepperman until March 1938, and then Wayne Rogers for the remainder of the run.