“The Sign of Three” is not Sherlock‘s strongest episode, but it’s one of my favorites. If it was not for Benedict Cumberbatch and Martin Freeman, I would not have sat through what amounted to little more than a 90 minute best man speech. While the show will not go down as the best Sherlock episode, it was impressive that the writers pulled it off. It also showed that the lighter tone in the previous episode is here to stay, at least for another episode or two.
Before John’s wedding to Mary Mortsan, Sherlock has to write his best man speech. It’s the hardest thing he’s ever had to do, so who does he call? Detective Lestrade, who just happens to be in the middle of solving the most important crime of his career. Having learned his lesson in the past, Lestrade drops everything and rushes to Baker Street with plenty of backup. He expects Sherlock to need help solving the crime. Nope. Sherlock called the police because he needs help writing funny stories about John. It’s a funny scene that show’s how much Lestrade relies on Sherlock, which is entirely too much.