An Elephant and Piggie Book: We Are In A Book! by Mo Willems

Gerald is careful. Piggie is not.
Piggie cannot help smiling. Gerald can.
Gerald worries so that Piggie does not have to.
 
Gerald and Piggie are best friends.
 
In We Are in a Book! Gerald and Piggie discover the joy of being read. But what will happen when the book ends?