This episode puts us right in the middle of another great mystery when a young man, Percy Phelps, working very late at the foreign office is copying a very important treaty for the British Government. Being alone, he takes a small break to go get some coffee from the night watchman when suddenly the bell rings from his office. No one is suppose to be in the room. When Percy runs back upstairs he finds that the treaty had been stolen. Now his job and his honor have been stained. Percy becomes bedridden with guilt and his last straw will be to get Sherlock Holmes to take the case.
A very nice episode with plenty of situations that, at the end, all lead the viewer to think outside of their limit. A very well written script with fine acting throughout. This is an episode you will watch again to see how many clues that were missed on the first view. Good watch.