The Tale of Despereaux by Kate DiCamillo

Here, reader, is the tale of a tiny, sickly mouse who takes is fate into his own hands. It is the tale of a beautiful princess who makes everything around her seem brighter. It is the tale a poor deaf serving girl who entertains foolish dreams. 
 
It is a tale of impossible love, of bravery and of courage.
 
And, reader, it is a tale of treachery. Unlimited treachery. 
 
"Full of charm, this heroic story of how goodness and courage can outsmart evil." Guardian
 
Suitable for ages 11-13 years old