The Adventure of the Bruce-Partington Plans is a classic Sherlock Holmes short story by Sir Arthur Conan Doyle. In the third week of November, in the year 1895, a dense yellow fog settled down upon London. From the Monday to the Thursday I doubt whether it was ever possible from our windows in Baker Street to see the loom of the opposite houses. The first day Holmes had spent in cross-indexing his huge book of references. The second and third had been patiently occupied upon a subject which he hand recently made his hobby--the music of the Middle Ages.