""Secret Societies of the 18th Century"" by Otto Henne Am Rhyn is a comprehensive exploration of the various secret societies that emerged during the 18th century. The book delves into the origins, beliefs, practices, and influence of these societies, which ranged from the infamous Illuminati to lesser-known groups such as the Martinists and the Strict Observance.Rhyn provides a detailed historical account of each society, including their founding...