I'm not crying; you're the one that's crying. This is just... allergies.
Such a sweet, touching end (?) to the Knuffle Bunny series. Trixie goes on a trip overseas to visit her grandparents, and accidentally leaves Knuffle Bunny on the plane! But she's a big girl now, and she dreams about all the adventures Knuffle Bunny is having, and all the other kids he's meeting, and she feels better. On the trip home, Trixie finds him again, and makes a Very Grown Up Decision that makes everyone happy (but a little bit sad too).
Like I've commented before, I really like Willems' artwork in these books; the combination of his drawings and the photographic backgrounds (especially on the plane and in Holland) are really cool. I also like how, when Trixie is reading, she's reading an Elephant and Piggy book, and one of the other toys in her bedroom is a stuffed Leonardo. I like when authors put little self-references like that in their books.
The story is a little longer in this book than in the other volumes, but that shouldn't prevent a child from staying engaged. The excitement of travel and the lost bunny will keep them entertained, and the lesson about saying goodbye to childhood friends is well-written.