Robert Louis Stevenson's seminal novella, first published in 1886, explores the duality of human nature through the story of Dr. Jekyll, a respectable London physician, and the mysterious Mr. Hyde. Written during the Victorian era's anxieties about scientific progress and moral restraint, the work has become a foundational text of psychological horror. Readers should expect a gripping tale of moral corruption, scientific transgression, and the terrifying consequences of unleashing one's darker impulses.