The whole concept, as presented in the book's description, appealed to me, but when I got into the story, it felt a little heavier, and a little less magical than I was expecting. The sample takes us right to the brink of each of the siblings starting to make their way as individuals. We know their life expectancy predictions, except Simon's is a bit vague, and we can assume as the book progresses, we'll watch as their potential predictions play out.