The Adventure of the Engineer's Thumb

"The Adventure of the Engineer's Thumb", one of the 56 short Sherlock Holmes stories written by British author Sir Arthur Conan Doyle, is the ninth of the twelve stories collected in The Adventures of Sherlock Holmes. The story was first published in Strand Magazine in March 1892. Dr. Watson notes that this is one of only two cases which he personally brought to the attention of Sherlock Holmes.
The story, set in 1889, mainly consists of a young London consultant hydraulic engineer, Mr. Victor Hatherley, recounting strange happenings of the night before, first to Dr. Watson, who dresses the stump where Mr. Hatherley's thumb has been cut off, and then to Sherlock Holmes himself.