Popular fiction and genre fiction at the start of the 20th century also included detective fiction, like the mysteries of the author and journalist Gaston Leroux who is credited with the first "locked-room puzzle" -- "The Mystery of the Yellow Room", featuring the amateur detective Joseph Rouletabille (1908) -- and the immensely popular "The Phantom of the Opera" (1910). Maurice Leblanc also rose to prominence with the adventures of gentleman-thief Arsene Lupin, who has gained a popularity akin to Sherlock Holmes in the Anglophone world.