The Adventure of the Black Baronet is a Sherlock Holmes

Sherlock Holmes

Sherlock Holmes is a fictional detective created by Scottish author and physician Sir Arthur Conan Doyle. The fantastic London-based "consulting detective", Holmes is famous for his astute logical reasoning, his ability to take almost any disguise, and his use of forensic science skills to solve...

 murder mystery written by Adrian Conan Doyle

Adrian Conan Doyle

Adrian Malcolm Conan Doyle was the youngest son of Sir Arthur Conan Doyle and his second wife Jean, Lady Conan Doyle. He had two siblings, a sister, Jean, and a brother, Denis....

. The story was published in the 1954 collection, The Exploits of Sherlock Holmes

The Exploits of Sherlock Holmes

The Exploits of Sherlock Holmes is a short story collection written by Adrian Conan Doyle and John Dickson Carr, first published in 1954.The stories contained in the collection are:*"The Adventure of the Seven Clocks"*"The Adventure of the Gold Hunter"...

, a joint enterprise of John Dickson Carr

John Dickson Carr

John Dickson Carr was an American author of detective stories, who also published under the pen names Carter Dickson, Carr Dickson and Roger Fairbairn....

 and Adrian Conan Doyle.

Holmes and Watson are relaxing in their vacation hotel in East Grinstead

East Grinstead

East Grinstead is a town and civil parish in the northeastern corner of Mid Sussex, West Sussex in England near the East Sussex, Surrey, and Kent borders. It lies south of London, north northeast of Brighton, and east northeast of the county town of Chichester...

 when Inspector Gregson of Scotland Yard

Scotland Yard

Scotland Yard is a metonym for the headquarters of the Metropolitan Police Service of London, UK. It derives from the location of the original Metropolitan Police headquarters at 4 Whitehall Place, which had a rear entrance on a street called Great Scotland Yard. The Scotland Yard entrance became...

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.

"Yes! Ask the butler, Gillings! It's an old hunting–dagger: hung there for years. Now look at the wound in Colonel Dalcy's throat."

Inured as I was to scenes of violence, I stepped back. Bassett, laying hold of that yellow hair which was tinged with grey at the temples, raised the dead man's head. Even in death it was an eagle face, with a great curving nose above a remorseless mouth.

"The dagger, yes," said Holmes. "But surely an odd direction for the blow? It appears to strike upwards from beneath."