The Horse and His Boy by C.S. Lewis
When Shasta discovers he is not The son of Arsheesh and therefore does not belong in the cruel land of Calormen, he joins forces with Bree the talking horse and flees north towards Narnia, where freedom reigns. And so begins their hazardous journey, fraught with mystery and danger. The capital city of Tashbaan must be crossed, a harsh desert endured, the high mountains of Archenland climbed, their enemies overcome. For the young Shasta it is an adventure beyond his wildest dreams and one destined to change his life forever. RecommendedFor ages 8 to 12.
The Chronicles of Narnia, Book #3