At its core however, the heart of Sherlock is the relationship between the two main characters, Sherlock Holmes and John Watson.
Fans of the hit BBC show Sherlock have been waiting quite a long time for the fourth season.
A number of questions will soon be answered; everything from what the long dead (?) Moriarty set in motion to torment Sherlock is, to how Watson being a father will affect the man and the show.
Fans have often waited years between seasons, and are then rewarded with only three ninety-minute episodes.