"The Mystery of the Yellow Room" by Gaston Leroux is a mystery novel first published serially in 1907. One of the first locked-room mysteries, it follows young reporter Joseph Rouletabille as he investigates an impossible crime at a French château. A woman is found brutally attacked in a room locked from inside, with no apparent way for the attacker to escape. Rouletabille races against France's top detective to solve the puzzle, but the culprit seems to vanish repeatedly. The truth involves hidden identities and dark secrets.