"Strange Case of Dr Jekyll and Mr Hyde" is a novella by Robert Louis Stevenson, published in 1886. It tells the story of Dr. Henry Jekyll, a respected scientist who creates a potion that transforms him into Mr. Edward Hyde, a violent and immoral alter ego. This transformation allows Jekyll to explore his darker impulses without facing societal consequences. As Hyde, Jekyll commits various crimes, leading to a growing conflict between his two identities. The novella explores themes of duality, morality, and the struggle between good and evil within a person. Ultimately, Jekyll's experiments lead to tragic consequences, highlighting the dangers of unchecked ambition.