Tomorrow and tomorrow is one of the finest I've ever read book's. Even though it's two stories in one, Sheffield looses none of the aspects of any of the stories, you still feel for the main character and can understand the evolution of the universe ... I should not really be writing a review, I can hardly describe the proportions of this book. I loved it, but it's not for someone without empathy for the characters or who can not understand the science, otherwise, it's amazing. This and "assembler of Infinity" are the two best books I've read in a long time, I wish there were more like this.