Gaston Leroux (1868-1927) was a French journalist and author of detective fiction. In the world of mystery literature, Leroux is renowned for his ingenious plots and his development of the 'locked room' mystery subgenre. His most famous work, 'The Mystery of the Yellow Room' (Le mystère de la chambre jaune, 1907), is heralded as a classic in this field. This novel introduced the intrepid journalist and amateur sleaver Joseph Rouletabille, who became a recurring character in Leroux's subsequent books. Leroux's narratives skillfully blend suspense, intricately woven plot-lines, and a vivid use of detail, which has earned him a respected place among the literary figures of the early 20th century. Prior to becoming a full-time writer, Leroux pursued a career in law and subsequently journalism, which informed his richly descriptive storytelling style and a flair for complex, layered narratives. His experiences as a court reporter and theater critic for L'Écho de Paris, undoubtedly influenced his literary output, granting authenticity to the settings and scenarios he portrayed in his fiction. 'The Mystery of the Yellow Room' stands as a testament to Leroux's literary craftsmanship and his masterful contribution to the detective genre, predating the works of Agatha Christie and paving the way for future mystery writers. Leroux's work remains influential, inspiring generations of authors and readers who have a penchant for the cerebral challenges posed by a well-conceived mystery.