Fallout question

What I mean is, I think Fallout will ruin the story. I haven't read the book so I need some insights from people who have.Crank and Glass were amazing but,I just don't get how you can continue the story from her kid. I read the first few pages in a preview and it seems like he doesn't know the whole story of his Mother anyway.
I honestly don't know if the book will be good or garbage,help please.