قصة الكتاب :
The Adventure of the Engineers Thumb, one of the 56 short Sherlock Holmes stories written by 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 . The Adventure of the Engineers Thumb takes its name from the basic fact that an engineer, by the name of Victor Hatherley, has had his thumb chopped off in a murderous attack . Hatherley had been employed by a shadowy German figure to repair a hydraulic press, and when the engineer had found out too much its operation . The case is one with no real mystery; the criminals are known, and even Victor Hatherley knows the reason why the attack occurred . The only possible mystery is the actual location of the press, and whilst Holmes deduces this, on arrival in the general locale, its location is obvious to all .