The Strange Case of Dr. Jekyll and Mr. Hyde, written by Robert Louis Stevenson, is a classic alternative history mystery novella. The story follows Dr. Henry Jekyll, a respected scientist who develops a potion that transforms him into the evil Mr. Hyde. As Jekyll struggles to control his alter ego, a series of mysterious events unfold, leading to a shocking revelation. Stevenson's exploration of duality and the dark side of human nature has made The Strange Case of Dr. Jekyll and Mr. Hyde a timeless classic in both the alternative history and mystery genres.