Robert Louis Stevenson, born in 1850 in Edinburgh, Scotland, United Kingdom and died in 1894 (at age 44) in Vailima, Upolu, Samoa (South Pacific Ocean). Scottish, Citizen of the United Kingdom He is a travel writer, novels, poems, essays, music, adventure novels and fantastic stories for teenagers. He is a prolific writer. His works are counted by ten. His style is marked by the multiplication of narrators. He is a great traveler. He visited France, Belgium, Italy, Italy, Austria, Germany, Australia and the Islands in the South Pacific Ocean. In 1876, Stevenson met his future wife Fanny, an American woman in the process of divorce. In spite of the opposition of his family, he went to join her in California and celebrate their marriage in San Francisco, in 1880. That same year, they make their return in Scotland. In 1887, Stevenson returned to the United States, to New York, hosted in the spotlight for his literary successes and especially his short novel Strange Case of Doctor Jekyll and Mr. Hyde, appeared a year rather. That same year, Stevenson decided to leave on a long cruise trip to visit Oceania and the Marquesas Islands, Gilbert Samoa. In 1890, Stevenson moved permanently to Vailima, acquiring land in the jungle, south of the capital of Samoa. This acquisition gave him wealth and stability, integrating even with the local population. In 1894, Stevenson died at age 44 and was buried there, revered and respected, 400 men took turns carrying his coffin to his final home. Admired by authors Jorge Luis Borges, Bertolt Brecht, Marcel Proust, Arthur Conan Doyle, Henry James, Cesare Pavese, Emilio Salgari, Ernest Hemingway, Rudyard Kipling, Jack London, Vladimir Nabokov, JM Barrie, and GK Chesterton. Nowadays, his literary fame ranks him as the 26th most translated author in the world. The Strange Case of Dr. Jekyll and Mr. Hyde is a short novel of science fiction, horror tales, psychological fiction, self-experimentation in medicine and especially multiple personality. This book was published in 1886. He has other names: Dr. Jekyll and Mr. Hyde or Jekyll & Hyde The story revolves around an investigation by a London lawyer named Gabriel John Utterson. He is intrigued and seeks to understand what is happening to his friend Dr. Henry Jekyll, who it seems, has another personality in addition to his own, that of Edward Hyde a fatal individual. A friend of Utterson, Dr. Hastie Lanyon, died of shock after receiving information about Jekyll. Lanyon, before his death, gave Utterson a letter to open only when Jekyll disappeared. Finally, with the help of a Jekyll employee, and opening his lab, they find Hyde wearing Jekyll's clothes and apparently dead of suicide. A letter from Jekyll to Utterson and also from Lanyon's reveal that Hyde drinking a serum is transformed into Jekyll. Jekyll did not want to assume his undeclared vices. He found the way to take Hyde's personality to indulge his vices without fear of detection, by drinking a serum of his invention. Unfortunately, accidents forced him to denounce himself. Characters: Dr. Jekyll is 50 years old. He has two personalities, one is good and sociable, it's Henry Jekyll. The other unhealthy one is Edward Hyde. For this, he creates a serum to hide his dark and unhealthy side, personified by Hyde. Unfortunately, this situation becomes uncontrollable to end in a suicide. Gabriel John Utterson, a lawyer and loyal friend of Jekyll and who is the narrator. It is up to him to unravel the story of Jekyll and his alter-ego. Utter's cousin Richard Enfield is the witness of Hyde's misdeeds. Dr Hastie Lanyon, friend of Utterson, witness of the dual personality of his friend Jekyll (and Hyde), falls ill and dies of shock felt. The novel includes several themes: the fable, the detective, Scottish devil tales. But especially this duality that could explain behaviors of private and public lives of the same individual.