Like previous Lois Lowry books (like The Giver, and Number the Stars) this book was extremely well written and wildly entertaining. It will be read and loved by millions. The only reason I am giving it a one angel rating, is that as much as I liked it, it's not something I could read over and over again. I don't know why, it's just one of those things. That said, it is definitely worth picking up and reading through to the end. The humor is witty and a little bit sarcastic. And the book references common themes in classic literature(orphans, wealthy donors, lovable nannies, etc.).
In the Willoughby family the kids and the parents both come to the conclusion that they would be better off without the other. So while the parents are hatching a Hansel and Gretel like plan to get rid of the children, the kids are trying to find a way to become orphans. The book guides us through both plots as both parties do whatever they can to achieve their goal.