This book is a very fast read, perfect for times you don't want to get caught up in a lengthy novel. This is one of those books that grabs you from the very first sentence, which I love. The setting and character development moves along nicely and keeps you well interested. It is only at the end, you realize the connection between the 4 individual stories and the true purpose of time travel. This book would be a great gift for older teens and young adults, as well.