The Horse and His Boy by C.S. Lewis

   The Horse and His Boy by C.S. Lewis is the third book in the Chronicles of Narnia.  Shasta, a young boy, was pushed to shore in a little row boat from somewhere in the world when he was just a baby.  After landing near a fisherman's hut, he was taken in and raised by the fisherman named Arsheesh.  When a Tarkaan came to their house for the night, he and Arsheesh bartered for a price to sell Shasta.  Shasta figured out he wasn't the son of Arsheesh, but he was from the North, a place he always dreamed of going.  Well as Shasta began to ponder his new life he started talking to the Tarkaan's horse.  Naturally he didn't think the horse would respond, but it did!  The horse named Bree said the Tarkaan was a bad man and that he himself wanted to get away to the North, to Narnia.  So not having a true home and dreading his future, Shasta and Bree head for the North.  On their daring journey, they meet Aravis, a young Tarkeena about Shasta's age also running away.  She was to be married to a sixty year old man that she hated!  She also had a talking horse, and together they go to Narnia.  They had one big hiccup in their journey.  While passing through the city of Tashbaan, Shasta is mistaken for a runaway Narnian prince.  Aravis knows the only way to get through the city is to reveal herself, so she does that when she sees one of her royal friends.  Both of them are taken to different palaces and learn valuable information.  Shasta learns that queen Susan doesn't want to marry an evil prince in Tashbaan, so they will leave for Narnia in the night.  He also hears a better way across the desert that separates Narnia from Tashbaan.  Aravis learns that Prince Rabadash (the evil one that wants to marry Susan) is planning an attack on Narnia.  Well they both get out of the palace eventually and then the race is on.  They have to beat Rabadash across the desert to save Narnia.  They reach a hermit and stop to recover after they were attacked by a lion on the way over.  Shasta, however, has to keep going to warn the Narnians.  He finally makes it and they go to battle and win.  Shasta finds out that the prince he was mistaken for is really his twin brother.  Shasta's real name is Cor and he is a prince.  He has a father that is king and it was prophesied that he would save Narnia one day so he was kidnapped and sent away and landed at the fisherman's house.  So, Prince Cor lived a happy life, married Aravis, and became King.