The last episode of "Sherlock" did not please the fans as much as it should. With comments saying the show lost its way, according to The Guardian,
However, the new episode puts the detective back on track, with a newspaper proprietor named Charles Agustus Magnussen for a villain, and plenty of twists that fans have been craving for.
One scene that will shock fans, as it did John, was when Sherlock became love-locked with Janine. Of course, viewers learn quickly that the capacity to love is still lost on the detective. He was, in fact faking the relationship (and engagement) to become close to the main antagonist, Magnussen's PA.
Then, John's beloved Mary turned out to be an assassin who had Magnussen held at gunpoint. Viewers didn't get the chance to find out how her involvement in the case related to Sherlock, though, before she shot him in the chest.
The three seconds it took for Sherlock to fall gave two guest appearances from Red Beard and the chilling Moriarty, who lured Sherlock into a padded cell, teasing him, "You'll love death, Sherlock. No one ever bothers you."
Janine got her own little vendetta by telling tabloids about the detective's death, but another twist is that Mary never meant to kill her husband's best friend. She merely wanted him to be an inch from death. It was revealed that Mary is a former spy and assassin who changed her identity. Of course, she can't be safe while a newspaper proprietor knows of her true identity.
That was not the end though. Cut to Christmas: Mary is pregnant, and things have been reconciled between her and John. Of course, Sherlock has never been the one to let things go, so he proceeded on to drugging everyone in an attempt to break into Magnussen's secrets, which the newspaper proprietor already second-guessed and went on to frame them for selling secrets of the state.
Recap aside, the last episode, according to The Mirror, is more of a family affair, with Louis Moffat (son of Steven Moffat, producer of the show) playing the young Sherlock, and Cumberbatch's parents as his on-screen mother and father.
The producer said that including a young Sherlock is natural. "Once you've got the parents in and you've got the sibling rivalry and stuff, people start to think, 'well what was young Sherlock like?' You just want those things, you want to see those things, it's part of updating it."