The Adventure of the Mazarin Stone

"The Adventure of the Mazarin Stone" is a Sherlock Holmes short story that features Holmes using a clever visual trick with a wax effigy to outwit a diamond thief named Count Negretto Sylvius. Holmes's strategic plan involves setting a trap to identify the criminal and recover the stolen jewel, leading to a tense confrontation with the thief and his accomplice. The story showcases Holmes's ingenuity and is part of Arthur Conan Doyle's collection in The Case-Book of Sherlock Holmes.