The Adventure of the Black Baronet
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"The Adventure of the Black Baronet" is a Sherlock Holmes murder mystery written by John Dickson Carr and Adrian Conan Doyle. The story was published in the 1954 collection, The Exploits of Sherlock Holmes.
Holmes and Watson are relaxing in their vacation hotel in East Grinstead when Inspector Gregson of Scotland Yard arrives to obtain assistance in a dreadful murder. Colonel Jocelyn Dalcy, a guest in the home of Sir Reginald Lavington, has been found stabbed to death. No weapon was found, but a dagger is missing from a nearby display. Sir Reginald claims he was using it while fishing and mislaid it. All suspicion falls upon him, and Gregson is about to make the arrest, but Holmes asks for a day to do some more research. An interview with the beautiful Lady Lavington provides the final clue.