Examine the subtle humour in the narration of the story that lightens the gravity of the subject matter.

The story's wittiest character is the detective Sherlock Holmes whose digressions are most funny. How in the middle of a sensitive interrogation he points out to the suspect that he appears to be a English, though the suspect exclaims that he is an American. In the beginning when Holmes is explaining the case to Watson, he remarks that there is a chance to make money with this case as if it is they and not the Garridebs who will be given the inheritance Alexander Garrideb. The most interesting part is the style with which Holmes talks or discusses any information. Even while explaining a serious matter he adapts a casual style. For example, again while in the beginning Holmes is explaining the case to Watson, he did not give away the people already involved in the case. However, he tells that Nathan is already taken in as Watson comes across his name in the directory. He did not even tell the name of the mastermind John Garrideb until Mrs. Hudson approached with the card signed by Garrideb. There are many such instances that make the mystery light-hearted and the reader is not burned by it.