"The Parasite: A Story" is a psychological horror novel written by Arthur Conan Doyle. The story revolves around a university professor, Austin Gilroy, who studies physiology. He comes across a woman, Miss Penclosa, who has the ability to control his thoughts and actions through hypnosis and telepathy, turning him into a 'parasite.' The book explores the battle within Gilroy's mind as he tries to resist her control and regain his freedom.
