"Le mystère de la chambre jaune" by Gaston Leroux is a detective novel published in 1907. When Mathilde Stangerson is brutally attacked inside a locked yellow room with closed shutters, young journalist Rouletabille races against detective Frédéric Larsan to solve the impossible crime. The victim lies near death, yet no attacker could have escaped. This locked-room mystery unfolds at the Glandier estate, where secrets, disappearing assailants, and cryptic phrases lead to a shocking revelation about the victim's hidden past.