An experimental aviator and a cryogenicist is flying over Siberia when forced to land when they find the body of a caveman frozen into a newly uncovered glacier wall - Jimber-Jaw awakens to find his world has changed and it is now the twentieth century! Excerpt: I met Pat Morgan at the country club bar, one of those casual things. After the third highball we were calling each other by our first names. By the sixth we had dragged the family skeletons out of the closet and were shaking the dust off them. A little later we were weeping on one another's shoulders, and that's how it began.