Over the years, scholars have labored to show that C. S. Lewis's famed Chronicles of Narnia have an underlying symbolic coherence, pointing to such possible unifying themes as the seven sacraments, the seven deadly sins, and the seven books of Spenser's Faerie Queene. None of these explanations has won general acceptance and the nature of Narnia's symbolism has remained a puzzle. Michael Ward has finally solved the mystery. In Planet Narnia, he argues convincingly that medieval cosmology, a subject which fascinated Lewis throughout his life, provides the imaginative key to the seven novels. Drawing on the whole range of Lewis's writings (including previously unpublished drafts of the Chronicles), Ward shows that the Narnia stories were designed to express the characteristics of the seven medieval planets - the Sun, the Moon, Mars, Mercury, Venus, Jupiter and Saturn - planets which Lewis described as 'spiritual symbols of permanent value' and 'especially worthwhile in our own
