The Chronicles of Narnia
This book is set 1300 years after The Lion, the Witch and the Wardrobe. Narnia is ruled by the Telmarines, a very mean people. The Pevensie children are called to Narnia by Susan's horn, which is blown by Prince Caspian. There is a big war between the Telmarines and Narnians. At the end of the book, Peter and Susan are told that they will not be able to come back to Narnia. The book was published in 1951.