The Mystery of the Yellow Room

Mathilde Stangerson is found brutally attacked inside the Yellow Room at the Château du Glandier. The door was locked from within, there appears to be no usable exit, and the assailant has vanished. A bloody handprint, old boots, and a bloodied mutton bone remain, but the abundance of physical evidence only makes the escape more difficult to explain.

Joseph Rouletabille, a young reporter and amateur detective, investigates with his friend Sainclair. The official detective Frédéric Larsan develops his own theory and treats Mathilde's fiancé, Robert Darzac, as a likely suspect. Rouletabille must determine which observations are reliable, how the room could have been sealed, and what the people at the château may be concealing.

Gaston Leroux makes the architecture of the crime part of the argument. The Mystery of the Yellow Room invites the reader to test each proposed solution against doors, windows, timing, testimony, and motive. Its central pleasure comes from the discipline of the “impossible” problem: a dramatic explanation is not enough unless it accounts for every constraint. Rouletabille and Larsan also represent competing habits of reasoning, so their rivalry helps expose how assumptions can determine which clues an investigator notices.