Michael Ward always loved these stories, but he had questions. Why did some of the books contain clear allegories of Biblical stories, while others were less obvious? Why is Christmas mentioned so frequently in The Lion, the Witch, and the Wardrobe, when no person named Christ existed in that universe? (Why wasn't there an Aslanmas holiday, instead?) Does any unifying theme other than Christianity tie together all the novels?
In The Narnia Code, Ward concludes that Lewis's novels each focus on one of the seven planets recognized by astronomers of the Middle Ages. These astronomers believed that the Earth was the center of the universe and defined planets as bodies that moved across the skies (as opposed to stars, which were fixed in their positions). They recognized Mercury, Venus, Mars, Saturn, Jupiter, the Sun, and the Moon as planets. The ancients often referred to the spheres in which these planets rotated as "The Seven Heavens".
According to Ward, each of the seven novels reflects the properties of one of these planets or of the beings for which it is named. More specifically, it represents attributes of Jesus that are similar to those beings.
The Lion, the Witch, and the Wardrobe, for example, focuses on Aslan as Jupiter - a jovial being who led all heavenly creatures; while the battles of Prince Caspian reflect the warlike powers of Mars.
The author shows that Lewis had a fascination with the planets, as shown in many of his other writings. He even wrote a space trilogy that took the reader to Venus, Mars, and the Moon.
Ward argues that Lewis never explicitly stated these themes because he loved a mystery and wanted his readers to discover the connection themselves.
C.S. Lewis is long gone so we cannot ask him if Ward is correct. In fact, Ward never had the chance to ask Lewis himself, as he was born 5 years after Lewis's death; but Ward has spent years studying the life and works of C.S. Lewis and his hypotheses presented here are plausible. This book is interesting and entertaining, and it increased my appreciation for Lewis's Chronicles.