The Horse and His Boy by C.S. Lewis

An orphaned boy and a kidnapped horse gallop for Narnia . . . and freedom.

NARNIA . . . where horses talk and hermits like company, where evil men turn into donkeys, where boys go into battle . . . and where the adventure begins.

During the Golden Age of Narnia, when Peter is High King, a boy named Shasta discovers he is not the son of Arsheesh, the Calormene fisherman, and decides to run far away to the North—to Narnia. When he is mistaken for another runaway, Shasta is led to discover who he really is and even finds his real father.

Enter this enchanted world countless times in The Chronicles of Narnia.

This edition is complete with full-color cover and interior art by the original illustrator, Pauline Baynes.
 
- Goodreads Summary