
Readers of C. S. Lewis’s The Chronicles of Narnia will know what I'm talking about. Not in all its glory as in Book 1 (or 2), The Lion, the Witch, and the Wardrobe, but the ruins found many Narnian centuries later by the returning Pevensee children in Book 3 (or 4), Prince Caspian.
My son-in-law and I had a difference of opinion about the numbering of The Chronicles of Narnia books when the first movie came out. He wondered why the producers decided to film the second book first; I said that The Lion, the Witch and the Wardrobe was the first book out of the six, not the second. He said there were seven books in the series, not six. I discovered that it depends on your age and when you were first exposed to Lewis’s Chronicles. Originally there were six volumes, but nowadays a seventh, written last of all, is included. To make matters more confusing, however, the current publishing strategy puts the addition, The Magician’s Nephew, at the beginning and calls it Book 1 because it occurs first chronologically. The original Books 1 through 6 have been renumbered and are now called Books 2 through 7. If you ask me, that’s adding insult to injury.
I suppose nobody cares except older readers like me who remember the world the way it used to be (and ought to be), or people really into publishing trivia (not that I am).
C. S. Lewis is best known for his non-fiction books, but he also wrote a science-fiction trilogy for adults, not children, that might pique your interest. The titles are Out of the Silent Planet, Perelandra, and That Hideous Strength. Any time you read anything by C. S. Lewis, don't be surprised if you find yourself further up, and further in.