Dr. Jekyll has been experimenting with identity. He has developed a drug which separates the two sides of his nature, allowing him to abandon himself to his most corrupt inclinations as the monstrous Mr. Hyde. But gradually the journey back to goodness becomes more and more difficult, and the risk that Mr. Hyde will break free from Dr. Jekyll’s control puts all of London in grave peril. This groundbreaking tale of identity and morality is accompanied by several other of Stevenson’s best short stories, including “The Body-Snatcher,” “A Lodging for the Night,” “Markheim,” “The Misadventures of John Nicholson,” and “Thrawn Jane.”