Beware, The Usurpers!
Author: first_name: Robert W.
last_name: Krepps
Language: English
Year: 1951

A sci-fi horror tale in which alien monsters skulk about in human form! William Chester and his comrades find themselves alone in being able to recognize this malevolence. Discover what happens when a handful of brave people pit their forces against the might of Earth's secret masters and the governments they control! You will find romance, action, and daring speculation in this lost classic.  - Summary by Adam Benckeser