Drawing Down the Moon offers an almost academic historical account of the development, growth, and beliefs of pagan groups in the 1970s, covering both the US and the UK. Margot Adler, an author, journalist, and a Wiccan priestess herself, endeavors to provide readers with a comprehensive overview. It includes personal stories and anecdotes from Adler and other pagans, as well as survey results on festivals. The book describes the rise and fall of several belief systems and groups, and delves into the fundamental thought schools within the pagan community.
However, its drawback is that it is outdated. While the 2006 update makes some changes, it is not a complete update from the 70s to the present. Nevertheless, it is still a full and interesting compendium. The style is detached and journalistic, with Adler trying not to impose her own views. It can be dry and dense at times, but it's still an enjoyable read. The historical perspective is fascinating, introducing readers to pagan groups and cultures they may not have known existed. If you're interested in the history of paganism, this could be the overview you seek, but remember it's not a how-to book and its in-depth coverage stops at the 70s.