"Prince Caspian" begins one year after the events in "The Lion, the Witch and the Wardrobe" on a railroad platform where Peter, Edmund, Susan and Lucy are waiting for trains that will take them to their boarding schools. Suddenly they are transported into another world, and after a few adventures they realize that it is Narnia, where many centuries have passed in the meantime.

The second plot line involves young Prince Caspian, heir to the throne of Narnia, who has to flee from his usurping uncle Miraz. Deep in a forest he discovers some of the "Old Narnians" - talking beasts and dwarfs - and eventually decides to challenge his uncle for the kingship.

Things turn out bad for Caspian and his small army, and they end up besieged on Aslan's How, a hill built over the site of the ancient stone table that played such a crucial role in "The Lion, the Witch and the Wardrobe". In dire need, Caspian uses his most precious object, Queen Susan's Horn, to summon help.

This review does not want to give away too much more of the plot and spoil the reader's enjoyment, so let me just say that the two plot lines intertwine, there are thrilling battle scenes (including a formal duel) and a wonderful celebration at the end.

Lewis does a great job of showing the gradual re-transformation of the four children, who once again turn from being English schoolchildren to becoming Kings and Queens of Narnia.

To me, "Prince Caspian" is one of the three best books in the Narnia series, together with "The Lion, the Witch and the Wardrobe" and "The Magician's Nephew". In many ways, it repeats themes from "The Lion, the Witch and the Wardrobe", but adds an interesting perspective by having the events of the earlier book become the stuff of legend.