This was the bestselling book in the U.S. for 1990. It's vol. 4 in Auel's "Earth's Children" series featuring Ayla, an early human raised by Neanderthals. In this one, Ayla and her lover cross Europe in a sort of prehistoric road trip, with lengthy descriptions of flora, fauna, climate, geology, and anthropology. Fine with me, since for me scene-setting is the series' strength. I'm less a fan of the characters, dialog, and relationship drama.