"Sherlock" season 4 is still a few months away from its premiere, but the titles for each episode have been released, giving viewers a better idea of the individual stories that the season will tell. Each of the titles is notably drawn from a story written by "Sherlock Holmes" creator and author, Sir Arthur Conan Doyle.

The titles of the first two episodes were shared on the official "Sherlock" Facebook page. The title of the third and final episode, however, was not disclosed.

As revealed in the post, the first episode is titled "The Six Thatchers" and is reportedly based on Doyle's story "The Adventure of the Six Napoleons." The original story focused on the detective chasing after a criminal who was destroying the busts of Napoleon. In this modern retelling, it may focus on the destruction of busts of Margaret Thatcher.

"The Lying Detective" is the title of the second episode, and it is based on the story, "The Adventure of the Dying Detective." In this story Sherlock (Benedict Cumberbatch) is ill, and Watson (Martin Freeman) becomes the primary detective as he tries to find out what is plaguing his friend.

BBC did not release the title for Episode 3, and TV Guide suggests that this could be the case since the title alone may be one big spoiler. The episode title might later be released when the show finally premieres. This is likely the episode where actor Toby Jones, who plays Culverton Smith, will become the main focus.

Screen Rant reports that the titles coincide with the previous clues given by series creator Steven Moffat, which were the names Thatcher and Smith. The third clue was Sherrinford Holmes, which is notably the name Arthur Conan Doyle was going to use before he decided to use Sherlock Holmes instead. The third episode's title is likely tied to this fact.

"Sherlock" season 4 will air in early 2017 on both BBC and PBS.