Dr. Henry Jekyll is a respected London physician with a theory: that every person is really two people, one decent and one depraved, locked together against their will. He brews a potion to separate them cleanly - and Mr. Edward Hyde is born, small, violent, and utterly without conscience. What starts as a controlled experiment in privacy becomes something Jekyll can no longer switch off, as Hyde grows stronger with every use and starts appearing uninvited.The novella that gave the world "e;Jekyll and Hyde"e; as shorthand for anyone with a hidden dark side - still one of the sharpest, tightest psychological horror stories ever written, and still capable of unsettling a reader who already knows the twist.