Sherlock: Every Episode Ranked Worst To Best

Much like The Blind Banker, this episode is a humorous, light-hearted adventure that ranks particularly high because we get to see the lovable trio of Sherlock, John and Mary with all introductions out of the way. It helps that the multiple mysteries all tie together in a clever and satisfying way, an element that could easily have derailed the whole script.

The Sign of Three is the romantic comedy that Sherlock never knew it needed, as we see Sherlock begin to soften, and John having to become more open and sensitive. Mary clearly brings out the best in the boys and holds her own against them both - at times outwitting them - as Sherlock tries to save the day, tie the clues together and actually be a decent Best Man to his friend on the most important day of his life.

Coming relatively late in the show, it's clear that Sherlock was in desperate need of an episode that wasn't going to devastate the audience, or get wrapped up in a complex case with the fate of the country at stake. Instead it reminds us that Sherlock is human, and that the little things in life are important even to him when it matters.