Tale of Despereaux

Tale of Despereaux: Being the Story of a Mouse, a Princess, Some Soup, and a Spool of Thread (book) by Kate DiCamillo
The adventures of Desperaux Tilling, a small mouse of unusual talents, the princess that he loves, the servant girl who longs to be a princess, and a devious rat determined to bring them all to ruin.

Tale of Despereaux (movie)