The Engineer's Finger

"The Engineer's Finger" is a work in the "The Adventures of Sherlock Holmes" series by Arthur Conan Doyle.
The story, the events of which take place in 1889, tells the strange story of a young consultant from London, a hydraulic engineer, Mr. Victor Hatherly.
A man who called himself Lysander Stark came to Hatherly. He offered Hatherley a job in a country house - for the apparently large sum of 50 guineas, to set up a mysterious hydraulic press...