[UPDATE] ‘Sherlock’ Season 4, episode 3 finale promo, spoilers: The great challenge for the Baker Street duo

The end game is here as Sherlock and Dr. John Watson face their greatest challenge ever. The promo for "Sherlock" Season 4, episode 3 finale revolves around what happens in "The Final Problem."

Warning: This article contains spoilers from "Sherlock" Season 4 episodes. Read to know more.

"Sherlock" Season 4, Episode 3 Finale Promo Trailer

Note: The promo will be uploaded as soon as the network makes it available, stay tuned.

Update: The promo for the finale is out and Watson wants Sherlock to keep it together. The promo shows a blast and Watson and Sherlock barely escape it.

Watch the trailer below.

"Sherlock" Season 4, Episode 3 Official Synopsis

The secrets buried in the past begin to surface in the finale of "Sherlock" Season 4. Sherlock and Watson meet someone who is playing a long game creating a massive challenge for the duo.

"In the final episode of this new series, written by Mark Gatiss and Steven Moffat, long buried secrets finally catch up with the Baker Street duo. Someone has been playing a very long game indeed and Sherlock and John Watson face their greatest ever challenge. Is the game finally over?

Benedict Cumberbatch returns as Sherlock Holmes, with Martin Freeman as John Watson, Mark Gatiss as Mycroft, Rupert Graves as Inspector Lestrade, Una Stubbs as Mrs Hudson, Amanda Abbington as Mary Watson, Louise Brealey as Molly Hooper," reads the official synopsis.

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This article will be updated.

Credit: YouTube/Promos and Previews