If yes, the question then remains as to which book, as there as so many on the phenomenon, some much better than others. I'm currently reading one now (Secrets in the Fields: The Science and Mysticism of Crop Circles by Freddy Silva) which is helpful and informative at times (that is to say, factual), but at other times it's very speculative and a little too "New Agey". However it is very much in keeping with the idea that the phenomenon is caused by some sort of advanced consciousness, not of our "dimension", and not by "aliens". That said, I don't recommend this book for the list, but I still recommend it to anyone with an open mind and an interest in the crop circle phenomenon. Its numerous diagrams and illustrations are quite excellent, and the geometrical analyses are intriguing.