•  Benedict Cumberbatch and Martin Freeman attend a screening of the Sherlock 2016 Christmas Special at Ham Yard Hotel on December 19, 2016 in London, England.

Benedict Cumberbatch and Martin Freeman attend a screening of the Sherlock 2016 Christmas Special at Ham Yard Hotel on December 19, 2016 in London, England. (Photo : Getty Images/ Jeff Spicer)

"Sherlock" Season 4 episode 2 is titled as "Lying Detective." It is going to feature a new villain named Culverton Smith, who is a greater threat than Moriarty.

Actor Toby Jones plays Smith to perfection and evokes a sense of dread in the viewers. "Sherlock" series co-creator Mark Gatiss revealed in an interview to Vanity Fair that the new villain is "purest evil." He added that Smith is a very dangerous villain and Sherlock realizes the threat that the former poses to humanity.

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Gatiss also said that the writers of the show have tried to showcase all kinds of villains in the four seasons of the show till now. He added that "Thus our other villains are very different: Magnussen was a businessman in the Murdoch vein-not evil as far he's concerned."

Regarding the latest villain, Gatiss revealed that Culverton is very different who does not hesitate to wreck havoc on the world. Culverton is quite a powerful personality in "Sherlock" Season 4 and he wants to abuse his power to the fullest.

Meanwhile, Sherlock and his mate John Watson are not on the best of terms as the latter feels that the former has let him down after the death of Mary. However, their sense of duty comes foremost and they team up together to fight against Culverton.

Apart from Culverton, the focus will also be the deepening rift between Sherlock and Watson. The reasons behind Mary's death will be explored in "Sherlock" Season 4 episode 2 and what she actually meant by "Save John."

Other "Sherlock" Season 4 episode 2 spoilers indicate that Watson will be shown as taking care of his daughter. He is still shocked by the sudden death of his wife Mary and is trying to come to terms with it.

"Sherlock" Season 4 episode 2 is said to be a very dark episode. Creator of "Sherlock" Steven Moffat revealed in an interview with Entertainment Weekly that the episode as well as the entirety of Season 4 is very grim. Moffat also said that they tried to lighten the tension in the series with the aid of some funny moments. 

Watch the "Sherlock" Season 4 episode 2 promo here: