'Sherlock' season 4 spoilers, plot news: Is Toby Jones playing the role of a German spy?

"Sherlock" season 4 has tapped "Wayward Pines" star Toby Jones for a villainous character in the second episode of the hit show's highly-anticipated new season.

Jones will play the role of a baddie in "Sherlock" season 4 that will bring trouble to the lives of Sherlock (Benedict Cumberbatch) and Watson (Martin Freeman). Who it is exactly is still the piece of the puzzle BBC is not ready to give away yet.

Expressing his excitement to work with Jones, "Sherlock" co-creator, writer and executive producer Steven Moffat revealed in a statement that the English actor will be "bringing to life one of Doyle's finest villains."

Jones said that he is "excited and intrigued" by the character he will play in "Sherlock" season 4. The same goes for co-creator, writer and EP Mark Gatiss.

"We're thrilled to welcome one of our finest actors to the Sherlock family. I know Toby will embrace the part with true relish!" Gatiss said.

According to Crave Online, Jones might play the role of Heinrich Von Bork, a German spy during the First World War and one of United Kingdom's most excellent operatives.

The "Captain America: Winter Soldier" star might also portray Hugo Oberstein in "Sherlock" season 4. He is another German spy in London and among the three best foreign agents in Britain.

For now, fans will have to wait for official information about the role Jones will play in Sherlock's lives and what sort of troubles he is prepared to bring him.

Meanwhile, another good thing about the episode of "Sherlock" season 4 that Jones will be starring in is that it is directed by Nick Hurran, who earned an Emmy nomination for his work in "His Last Vow," the third episode of "Sherlock" season 3.

"Great to have Nick Hurran back after his fabulous work in series three, and I've been wanting to work with Toby for ages, so this is a real treat," Hartswood Films Executive Producer Sue Vertue said.

"Sherlock" season 4 is rumored to premiere next year although Freeman stated recently that it might be ready by Christmas this year.