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When Mark Ablett, the wealthy and charming owner of the Red House, is found shot dead in his locked study, the local police are baffled. His estranged brother Robert has just arrived from Australia, and the circumstantial evidence seems to point directly at him.

But Tony Gillingham, a house guest and amateur detective, is not convinced. With the help of his level-headed friend Bill Beverley, Gillingham launches his own investigation into the seemingly impossible locked-room murder.

What follows is a delightful blend of classic detective puzzle and gentle British humor. As Gillingham pieces together the clues—the mysterious croquet mallet, the open window, the butler's curious behavior—he uncovers a web of secrets, jealousies, and unexpected loyalties lurking beneath the peaceful surface of country life.

First published in 1922, The Red House Mystery is A.A. Milne's only full-length detective novel, written between the Winnie-the-Pooh stories that would make him famous. It remains one of the most beloved and clever mysteries of the Golden Age.