Doomsday's Donuts

The story is about what would you do if angels told you the Future? Start a hedge fund, find a partner, have kids. But! Your mate angers the President and gets eliminated. You try to preserve her frozen head for later recovery. Then California falls into the sea, and the cryogenic warehouse is swamped. You and the kids make the best of it. Then you go off on migration to find land with other survivors. That's the story.