Title: Cluster (Cluster series, Bk. 1)
Description: From the back cover:

From the regions of Outworld to the land of the Canopians and beyond -- through the distant reaches of time and space and the vast spectrum of Kirlian apparitions -- Flint the Caveman is master and slave, conqueror and hero, slayer primeval and seducer triumphant...

FLINT OF OUTWORLD HAS COME!
Subjects: Fiction, science fiction, general, Fiction, science fiction, action & adventure