The Adventure of the Sealed Room
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The Adventure of the Sealed Room is a Sherlock Holmes murder mystery by Adrian Conan Doyle and John Dickson Carr. The story was published in the 1954 collection, The Exploits of Sherlock Holmes.
Rising early one morning for his medical practice, Dr. Watson discovers that his first patient is Cora Murray, his wife's friend. She informs Watson that Colonel Warburton is dead and his wife Eleanor Warburton is horribly wounded. Because the couple had locked themselves in a room with a collection of Indian antiquities before the gunshots were heard, the incident appears to be a murder-suicide caused by a sudden fit of madness in the Colonel.
Watson escorts Miss Murray to Sherlock Holmes' residence at 221B Baker Street, and Holmes soon becomes interested in the case. Holmes learns that Miss Murray, Major Earnshaw, and Captain Lasher (the Colonel's nephew) were all in the house at the time of the tragedy, along with a sinister Indian servant.