Kennedy & Churchill's "The Voynich Manuscript" is much more than a book simply about one subject: it is a modern treatise on a rich seam of phenomena and the range of eccentric, occult and devious characters throughout European history who have shaped them.
On the surface, it is a book about one subject: the (likely mediaeval) manuscript written in code (its various sections illustrated with pictures of plants, astronomy, naked dancing nymphs and unintelligible symbology) that has defied attempts at deciphering, from the early students of occult and mystical languages through to the modern cipher-breakers of wartime Europe. It also builds up a chronologically formatted story of the Manuscript from its first appearance in records to its current whereabouts.
In the quest to discover who might have written the manuscript, why they wrote it, and ultimately to decipher its message, Churchill & Kennedy manage to create a cyclopedia of information, a Fortean who's-who of strange people and what's-what of strange phenomena, all who may have been connected in some way with the manuscript, or knowledge of which might assist them in their understanding of it.
Thus we travel through the ages learning about various people and various phenomena, including the life and works of characters such as Roger Bacon, Dr John Dee, St Hildegard and Voynich himself; and in the process discovering the Shakers and the spirit-world, magic and mediaeval science, how migraines work, how codes and ciphers work, and so on, and on ...
How the authors managed to get so much information, interestingly written and clearly explained, in one 300 page volume is a mystery almost as great as the one they are researching.
It's certainly one of the most interesting reads I've had of late and thoroughly recommended.