of piracy, buried treasure and adventure; has been filmed frequently. In an 1881 letter to W. E. Henley, he provided the earliest-known title, "The Sea Cook, or Treasure Island: a Story for Boys". Prince Otto (1885) – Stevenson's third full-length narrative, an action romance set in the imaginary Germanic state of Grünewald. Strange Case of Dr Jekyll and Mr Hyde (1886) – a novella about a dual personality; much adapted in plays and films; also influential in the growth of understanding of the subconscious mind through its treatment of a kind and intelligent physician who turns into a psychopathic monster after imbibing a drug intended to separate good from evil in a personality. Kidnapped (1886) – a historical novel that tells of the boy David Balfour's pursuit of his inheritance and his alliance with Alan Breck Stewart in the intrigues of Jacobite troubles in Scotland. The Black Arrow (1888) – a historical adventure novel and romance set during the Wars of the Roses. The Master of Ballantrae (1889) – a tale of revenge set in Scotland, America and India. The Wrong Box (1889) – co-written with Lloyd Osbourne. A comic novel of a tontine; filmed in 1966 starring John Mills, Ralph Richardson and Michael Caine. The Wrecker (1892) – co-written with Lloyd Osbourne and filmed in 1957 as a television series episode of Maverick starring James Garner and Jack Kelly, with full credit to Stevenson and Osbourne. Catriona (1893) – also known as David Balfour; a sequel to Kidnapped, telling of Balfour's further adventures. The Ebb-Tide (1894) – co-written with Lloyd Osbourne. Weir of Hermiston (1896) – unfinished at the time of Stevenson's death; considered to have promised great artistic growth. St Ives (1897) – unfinished at the time of Stevenson's death; completed by Arthur Quiller-Couch. Short story collections New Arabian Nights (1882) (11 stories) More New Arabian Nights: The Dynamiter (1885) (co-written with Fanny Van de Grift Stevenson) The Merry Men and Other Tales and Fables (1887) (6 stories) Island Nights' Entertainments (1893) (3 stories) Fables (1896) (20 stories: "The Persons of the Tale", "The Sinking Ship", "The Two Matches", "The Sick Man and the Fireman", "The Devil and the Innkeeper", "The Penitent", "The Yellow Paint", "The House of Eld", "The Four Reformers", "The Man and His Friend", "The Reader", "The Citizen and the Traveller", "The Distinguished Stranger", "The Carthorse and the Saddlehorse", "The Tadpole and the Frog", "Something