Exciting conclusion to this trilogy. I couldn't wait to find out what happened at the end. Overall, I really liked it. My only complaint, which can't really be helped, was that the solution in the end brought you back to the beginning. Peter and Kate don't know each other, and you lose all the growing they did in the 3 volumes. It was really the only way to go, but I was left feeling a little like, what was the point in going through all that with them? Also didn't understand how the scientist was able to retain knowledge of all that had happened if they truly went back to before it all began...