Im Not Santa! is a cute book about a case of mistaken identity.  It takes a visit from the Jolly Old Man himself to sort this out.  This book is perfect for any little kids that have short attention spans.  It is simple and to the point.  The illustrations are great too.   I would actually say that this is more of a picture book than a story book.  This is under a series of books by the author.  Some other great choices would be Im Not Cute! and Im Not Scared!