by Arthur Conan Doyle (Author)

This is the third and last novel in the "Professor Challenger" series, and is a marked departure from the previous tales. In this novel Challenger becomes a Spiritualist, and the novel strongly promotes the concept of Spiritualism. A belief strongly adopted by the author towards the end of his life. This novel was first published in a serial form in "The Strand" magazine July 1925-May 1928.