Set in the golden age of Narnia when Peter, Susan, Edmund and Lucy ruled, in the land of Calormen, this story tells of the adventures of Shasta, a slave boy and Aravis, an aristocratic girl. Shasta dreams of escaping his life. One day he learns that his master's horse is a talking horse called Bree who has been kidnapped from Narnia and desperately wishes to go home, and the two run away. Aravis has been promised in marriage to a man she does not live, and she too seeks escape on her talking horse, Hwin. As their paths cross the children and their horses uncover a Calormene plot to conquer Narnia. They must find a way to save Narnia and its people.