Not very long after "The Silver Chair" in Earthly time, but generations later by Narnian time, Eustace and Jill are called back to Narnia to join its last king, the righteous Tirian, in his last stand against evil. Heathen Calormenes, with the aid of a treasonous Narnian Talking Ape, have disrupted Narnian society by tricking many Narnians into believing that Aslan's nature has changed. Tash, the demon worshipped by the Calormenes, is behind it all. Tirian and the children are finally unable to prevent the invasion and conquest of Narnia; but it turns out that what really mattered was everyone having the chance to decide whose side they were on. Aslan--clearly understood to be Jesus Christ--brings the Narnian world to an end, and all who were faithful to Him find themselves in Heaven; this includes not only Tirian, Eustace and Jill, but Professor Kirke, his friend Polly, and all of the Pevensies except Susan--because they died in a train crash. Susan is left in mortal life because she needs more time to get right with God.