A Rage for Revenge — David Gerrold

THE WAR AGAINST THE CHTORR
Still reeling from the alien plagues that killed two-thirds of the planet's population, humanity now confronts the most deadly enemy Earth has ever known...the giant man-eating Chtorr.

Lieutenant James McCarthy has grown to manhood under the shadow of the terrifying invasion of the Chtorr. As a student, he learned all he could to understand their alien behavior. As a Special Forces commando, he made violent first contact. Now this battle-hardened warrior faces a profound challenge. Captured by an anarchistic band of men and women known as renegades, McCarthy must secretly gather vital information while fighting indoctrination into their cult ...which serves and worships the Chtorr.