The Last Battle (The Chronicles of Narnia, Bk. 7)

In the conclusion of this saga, Narnia is in trouble. A false Aslan roams the land. Narnia's only hope is that Eustace and Jill, old friends to Narnia, will be able to find the true Aslan and restore peace to the land. Their task is a difficult one because, as the Centaur says, "The stars never lie, but Men and Beasts do." Who is the real Aslan and who is the imposter?