Not only a Gothic novel but also an intriguing detective story and a forerunner of science fiction. Stevenson’s description of a respectable man who tries to escape his moral duties leads the reader to analyse dualism in Victorian society and inside the human soul, torn between its two extremes in the eternal fight between good and evil. This edition is specially tailored to the needs of English learners and contains the original text with numerous explanatory notes, an introduction, the keywords to understand the main themes and several activities.