What will happen on Season 4 of Sherlock? Predictions and spoilers are swirling for the final two episodes, “The Lying Detective” and “The Final Problem.” 

Sherlock’s “The Six Thatchers” left us with so many questions we need answered. First, we have to figure out what Moriarty had planned for Sherlock Holmes. And we have to see if Sherlock and John Watson’s relationship can ever be repaired after Mary’s shocking death.

CLICK HERE FOR MORE 'SHERLOCK' PREDICTIONS ...

Check out a ‘Sherlock’ promo here:

WARNING: SPOILERS BELOW

Right now, Watson’s taking care of the baby and refusing to see Sherlock after Mary's death. But Mary sent Sherlock one more mission: Save John. So will the two men be able to fix their friendship?

There are also a few big mysteries on Season 4 of Sherlock. While Sherlock’s looking for the game Moriarty laid out for him, there will be a new villain: Culverton Smith. Creator Mark Gatiss described him as “purest evil.”  Gatiss added that Smith is “very much a man of these strange, rootless, dark times. What can you not do if you have power?” 

BENEDICT CUMBERBATCH HAD A BABY BOY! DETAILS ...

Answers may also be revealed about the third Holmes brother on Sherlock. There are theories that he’s named Sherrinford. “Well. We’ll see. The clues are there …” Gatiss said of the mystery brother.

Check out a ‘Sherlock’ promo here:

First, though, we have to get through the second episode of Sherlock Season 4“The Lying Detective” will be loosely based on the Sherlock short story The Adventure of the Dying Detective.

And a new promo shows that we will be introduced to Culverton Smith this week on Sherlock. Smith will have his own “very dark secret” that Sherlock will have to uncover. “This is the most dangerous, the most despicable human being that I have ever encountered!” Sherlock says. “This monster must be ended.”

CLICK HERE FOR BENEDICT CUMBERBATCH'S WEDDING DETAILS ...

And predictions say that Sherlock will continue to get dark as Season 4 progresses. But there will still be some humor.

“Anything can happen to anyone. I think it’s safe to say we couldn’t do Sherlock Holmes and Dr. Watson without Holmes and Watson,” creator Steven Moffat told EW. “But nobody’s safe and consequences are everywhere and there’s some emotionally grueling stuff coming. There’s proper humor too. We showed Episode 2 to some people and though it’s the darkest one we’ve ever done there were still people laughing.”

Were you shocked by Mary's death on Sherlock? Let us know your take in the comments section below!