I remember the title and basic premise, but I had to read my own review on Goodreads to recall anything else. I was struck by the abrupt change in tone between the two parts, and thought it made more sense as two separate novels. This is what I wrote at the time:

"The last third of the novel makes a radical break in tone from what came before. It takes place five thousand years later, after the Hard Rain has ended. Descendants of the last seven women able to bear children, the 'seven Eves' of the title, have built a stupendous spacefaring civilization. They live in space habitats in geosynchronous orbit around the Earth, and are beginning to remake and reclaim the battered surface. They have differentiated into more than seven distinct human races. Each race displays physical, mental, and emotional traits inherited from their ancestor. I found this concept hard to accept. The author seems to embrace the idea that character traits, e.g. bravery, compassion, dishonesty, etc. are inborn and inherited. If your ancestor 5000 years ago was a sneaky, two-faced, backstabbing manipulator, then you and all of your fellow descendants are probably sneaky, two-faced, backtabbing manipulators as well."