This is a unique picture book about a poor mouse who lives under the floor of a castle where a princess and her many cats enjoy a life of luxury and splendor.   The mouse has the idea to bell the cats, with a nod to Aesop’s fables, so that he might know where they were and avoid them to enjoy the amenities of the castle.  In the end after many failed attempts, he befriends the princess and she bells the cats.  I especially enjoyed looking at the illustrations, which are beautifully detailed with rich texture and colors.