Dadi Janki, the unusual subject of this biography, presides over a unique global spiritual empire run and led by women. Born in 1916 into a traditional Hindu family, she was expected to follow the standard pattern for Indian women of the day, which was to succumb to an arranged marriage at the earliest possible opportunity and then disappear from view. But she had other ideas. Since the age of two, she has only ever wanted to connect to one being,...