Gaston Leroux was born on 6 May 1868 in Paris and after school in Normandy, he returned to Paris to study law. His extreme gambling is well-documented after he squandered the millions he had inherited, narrowly escaping bankruptcy. He worked as a court reporter and theatre critic before landing a job as an international correspondent for Le Matin.

During this time Leroux travelled to Russia to experience and report on the Russian Revolution. In 1907 he gave up journalism to become a writer, and quickly found success with Le Mystore de la Chambre Jaune (1908). He became well-known for his popular and acclaimed crime and thriller novels, but Leroux also wrote poetry and short fiction.

His most famous work, Le FantPme de l'OpUra (The Phantom of the Opera), was inspired by a tour of the cellars at the Paris Opera, and published in 1911. The story has been adapted for film and, most notably, for Andrew Lloyd Webber's long-running musical. Gaston Leroux died on 15 April 1927.

Leslie S. Klinger is one of the world's foremost authorities on Sherlock Holmes. He is the editor of the three-volume The New Annotated Sherlock Holmes. The first two volumes, The Complete Short Stories, won the Edgar for Best Critical/Biographical work. He is also the editor of the hugely successful The New Annotated H.P. Lovecraft. Klinger is a member of the Baker Street Irregulars and lives in Malibu, California.