RETURN TO EDEN (Spectra Series)

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Return To Eden is a 1988 science fiction novel by American writer Harry Harrison.
The novel is the third and final volume in Harrison's Eden. The first two stories of the trilogy are West of Eden and Winter in Eden.
The novel tells an alternate history of planet Earth in which the extinction of the dinosaurs never occurred. There is a war between a group of Cro-Magnon-level humans and a reptilian race called the Yilanè, who are descended from the prehistoric mosasaur and have become the dominant lifeform on the planet.
The central characters from the first book return, Vaintè, an ambitious Yilanè, and Kerrick, a "ustouzou" captured by the Yilanè as a boy and raised by them. Kerrick eventually escapes to rejoin his own people and burn the Yilanè colony city.