The Adventures of Sherlock Holmes - The Adventure of the Engineer's Thumb
Summer of '89, not long after Watson's marriage. 7am, Mr. Victor Hatherley, a hydraulic engineer comes to see Watson because one of his thumbs came off.
Story: Hatherley describes himself as an orphan and a bachelor, the exact thing Colonel Lysander Stark is looking for in an employee for the job. He demanded full secrecy for the job. That night, they drove around in a carriage for awhile and went to a house of Germans. He was asked to look at a hydraulic press. While trying to fix it, he comes to the conclusion that the press isn't being used for what they said it was used for. Lysander tries to murder Hatherley in the press but he escapes with the help of the woman in the house. Lysander cuts of Hatherley's thumb during his attempt to escape from a second story window.
Result: The Germans were making counterfeit coins (it is assumed) with the press. The house was on fire and the criminals escaped by the time that the police arrived.