This being Sherlock, of course, fans are expecting something huge from the finale and have scrutinised past episodes for clues pointing towards possible revelations.
Fans are particularly excited because Sunday’s finale is titled ‘The Final Problem’ – could the cunning villain be making a surprise last minute appearance?
The scene in question is taken from season two, episode three, ‘The Reichenbach Fall,’ and features a heated interplay between Benedict Cumberbatch’s titular detective and recurring villain Moriarty (Andrew Scott).
“What is it all for?” asks Sherlock, to which Moriarty replies: “I want to solve the problem.