With World War II looming on the horizon, the Operator #5 novels became a reflection of the times, showcasing American fears of technology and oppression.
"The Masked Invasion" is the first entry in the series. Jimmy Christopher, Operator #5 in the American Intelligence Service, faces off agasint the Masked Empire, an organization that threatens the very existance of the United States with a super-weapon capable of plunging an entire region into total darkness -- with no ability to use electrical machinery!