"Dr. Jekyll and Mr. Hyde" is a classic novel written by the Scottish writer Robert Lewis Stevenson. This book tells the story of a scientist-surgeon, Jekyll, who invents a device that can separate the dark and light sides of human nature. However, the experiment goes out of control, and he turns into a terrible and ruthless figure - Mr. Hyde. The situation becomes even more complicated when Jekyll realizes that his altered state may be exposed and the danger it brings threatens his life and reputation. The novel explores the darker aspects of human nature, presenting the reader with a tense plot and helping to understand the eternal questions about morality, inner struggle and the consequences of our actions. "Doktoro Jekyll kaj Señor Hyde" is a masterpiece of Gothic literature that leaves an impact on the reader long after the reading is over.