Excellent history of important movement
This is an excellent, professional history of Theosophy, an important movement in the history of world religion. It explains the origins and differences of the various Theosophical organizations, provides a clear time line, and gives the best discussion I've seen of the founders. It is from the point of view of a historian, not a participant, so it is hard-headed but not unsympathetic, covering both the amazing successes and the astounding fraud involved.