Sir Arthur Ignatius Conan Doyle (22 May 1859 — 7 July 1930) was a Scottish writer and physician, most noted for his fictional stories about the detective Sherlock Holmes, which are generally considered milestones in the field of crime fiction. "The Parasite" is a novel released in 1894 by Sir Arthur Conan Doyle. Plot: The main character is a young man known as Austin Gilroy. He studies physiology and knows a professor who is studying the occult. The young man is introduced to a middle-aged woman known as Miss Penclosa, who has a crippled leg and psychic powers. She is a friend of the Professor’s wife. The skeptical Gilroy’s fiancee, Agatha, is put into a trance to prove Miss Penclosa’s powers. This succeeds and Gilroy begins to go to the Professor’s house where Miss Penclosa practices her powers on him. (Excerpt from Wikipedia)