Eustace Scrubb and a new character, Jill, return to Narnia to save a young prince from his evil captors. Early in the story is a small piece that almost haunts me (in a good way - like something that has become imbedded in my conscience), even as an adult. Because Eustace fails to greet an "old friend" much good that could have happened, is lost, and much work must be done before achieving his mission. The truths that underlie these sorts of details in this entire series are really wonderful.

Back to the plot... the young prince is being held captive, by flattery and brainwashing in an underground kingdom, out of the light of the sun. As with other books in this series, there is a fascinating meld of themes from classical literature and Christian virtues and ideas. This one in particular is reminiscent of Plato's "Cave Analogy". The allegory and adventure are both very strong as the two children and some interesting Narnia natives help to overthrow this evil kingdom.