Nay, I cannot give you that key. I cannot unlock for you the way that leads to Lantern Wood; nor lead you up to Cair Paravel of the four thrones, and bring you into its court, so grave and gay; nor show you the ship that rides at anchor, soon to depart for the uttermost East. I cannot do these things…

The key I offer is a humble key of knowledge, opening the secret meaning of the books. The seven books evoke the seven spheres: The Lion, the Witch, and the Wardrobe, Jupiter; The Horse and His Boy, Mercury; The Magician’s Nephew, Venus; Prince Caspian, Mars; The Voyage of the Dawn Treader, the Sun; The Silver Chair, the Moon; The Last Battle, Saturn. Lewis himself said there was a meaning behind the series, and wondered whether anyone would find it. Now they have – some years ago, in fact, but it is perhaps still not well enough known.  Read the book, and discover the proofs.