Actor Toby Jones will play the villain in the fourth season of "Sherlock".
No details about the character were released, reports deadline.com.
But co-creator, writer and E.P. Steven Moffat said: "Delighted to have Toby Jones on board, bringing to life one of (Arthur Conan) Doyle's finest villains."
Season four of the Emmy-winning "Sherlock" will begin with Sherlock Holmes (Benedict Cumberbatch) back on British soil as Dr. Watson (Martin Freeman) and his wife, Mary (Amanda Abbington), prepare for parenthood.
The series is written and created by Steven Moffat and Mark Gatiss and produced by Sue Vertue. The executive producers are Beryl Vertue, Mark Gatissm Steven Moffat, Bethan Jones and Rebecca Eaton.
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