If you have to much food or if your young
Gate because it has a similar sound (pronunciation) and so it is associated with the word late, fate, hate, etc.
Rereading. Or looking up unknown words.
The event in the story that is a key detail in Holmes’s solution of the case is "<span>a. the observation that Mr. Wilson belonged to the Freemasons" since this was the society that had raised suspicions before. </span>