In October 1916, Conan Doyle announced in the journal light his conversion to spiritualism. During the last years of his life, he became the crusader of this movement that preaches salvation of humanity through science.

Thus, from 1920 to 1923, he gave a series of lectures about spiritualism in Australia, in USA, and in Canada. He published his autobiography, Memories and Adventures in 1924 and opened a bookstore dedicated to spiritualism, The Psychic Bookshop in London, where he handled the editing of his own works. In particular he published The History of Spiritualism in two volumes and The Land of Mist, the latest adventure of Professor Challenger on a Spiritualism topic.

He spent more time on lectures: In 1925 in Paris, at the International Spiritualist Congress; in 1928 in London, at the Congress he chaired himself, and then in South Africa, Rhodesia, Kenya, Holland, and the Scandinavian countries. After these trips, in 1929, exhausted, he suffered a heart attack.

Nevertheless, against the advice of his doctors, he insisted on speaking at a ceremony commemorating the Armistice, then spent weeks in bed. He recovered slowly but on 7 July 1930 at dawn, he died from a final heart attack. His last words to his wife at his side were "You are wonderful". From from the phenomenal writer of the famous Sherlock Holmes novels, intellectual Arthur Conan Doyle brings you his final work. One of his most endearing, fascinating, and timeless entries: The History of Spiritualism Vol. 1.