The Red House Mystery is a "locked room" whodunnit by A. A. Milne, published in 1922. It was Milne's only mystery novel. Far from the gentle slopes of the Hundred Acre Wood lies The Red House, the setting for A.A Milne's only detective story, where secret passages, uninvited guests, a sinister valet and a puzzling murder lay the foundations for a classic crime caper. And when the local police prove baffled, it is up to a guest at a local inn to appoint himself 'Sherlock Holmes' and, together with his friend and loyal 'Watson', delve deeper into the mysteries of the dead man.