Watson recounts the history of Guy Fox Day, and the celebrations enjoyed by children in the streets to commemorate the demise of the would be assassin of yore. A man enters in fear of his life, thinking he may be dead in a matter of hours. With help from the medicine bag of Watson, the man calms down enough to tell his story.
The alleged murder attempt parallels that of Guy Fox, and the use of explosives. The idea amuses Holmes, but he digs for more details. Hitting the streets, the detectives find clues, but is it the kind of thing to do the explosive harm their client thinks? With his weak heart, it wouldn’t take much.
With all the clues he needs, Holmes returns to Baker Street to take the case to the next level, and prepare for a face-off with the bad guys. With all the role playing, and names tied to Guy Fox Day, Sherlock brings the deadly game to an end. Is it a conspiracy, or a prank that went all wrong?