"The Adventure of Shoscombe Old Place" is the last of the 56 Sherlock Holmes short stories by Arthur Conan Doyle. The story is part of the series The Case-Book of Sherlock Holmes first published in the Strand Magazine from October 1921–April 1927. The original title "The Adventure of the Black Spaniel" was changed before publication.
Head trainer John Mason from Shoscombe Old Place, a racing stable in Berkshire, comes to Holmes about his master, Sir Robert Norberton. Mason thinks he has gone mad. Sir Robert's sister, Lady Beatrice Falder, owns Shoscombe, but it will revert to her late husband's brother when she dies. The stable has a horse, Shoscombe Prince, who Sir Robert hopes will win the Derby. He would be out of debt if that actually happened.