Operator #5

Operator #5, America's Secret Service Ace, appeared in 48 novels in the classic pulp magazine bearing his name. From April 1934 to November 1939, Jimmy Christopher fought villains from inside the United States and invaders from without.
With World War II looming on the horizon, the Operator #5 books became a reflection of the times, showcasing American fears of technology and oppression. In Revolt of the Devil Men, after America has been invaded and nearly destroyed, Jimmy Christopher and his organization begin rebuilding efforts . . . only to face a new threat!
One of the bloodiest pulps ever produced, the Operator #5 books have a well-deserved reputation for thrill-a-minute action and peril. If you like pulp fiction, you'll love Operator #5.