"Sherlock" season 4 Spoilers: Shooting in Morocco

"Sherlock" season 4 is accelerating its production.

It has already begun production mainly in Cardiff and it is reported that the first episode has already been completed. According to Wales Online, "Sherlock Season 4" seems to be taking Holmes through more challenging puzzles as a dazed Benedict Cumberbatch was caught on camera. "Sherlock Season 4" reportedly relied on Cardiff University Student's Union and Cyncoed in Wales for numerous scenes

The second episode will be filmed in Marrakesh, Morocco, indicating a sudden shift in the series' primary setting, reports the Huffington Post Morocco.

It is still not known whether the Morocco scenes will be aired for episodes 2 and 3 or will they be inserted as well into the premiere episode.

It has been reported from Deadline says that Toby Jones has been casted to depict the main villain of the season and his character. It is said to be based on one of author Arthur Conan Doyle's finest villains.

Unfortunately, the exact identity of this villain and what scheme they have brewing remain a mystery. Despite the villain beng based on one of the characters from Doyle's written work, the series is a modern retelling and the Morocco setting does not match up with anything from the "Sherlock Holmes" short stories.

Morocco may also be the area where Jones's character resides or operates. The BBC has yet to issue any official teaser trailer or announcement and neither Jones nor the other cast members have given any official clues, therefore the information about Jones and the Morocco setting is still considered pure speculation.

"Sherlock" season 4 is predicted to premiere by Christmas in the U.K. and this may follow with a New Year's Eve or early January premiere in the United States. However, the BBC has yet to announce an official premiere date.