Killing Eve star Fiona Shaw has joined Millie Bobby Brown, Henry Cavill and Helena Bonham Carter in Enola Holmes, the new adventure film based on author Nancy Springer's Enola Holmes Mysteries.
The Hollywood Reporter, which broke the news of Shaw's casting, says Enola Holmes will see Stranger Things star Brown playing the younger sister of Sherlock and Mycroft.
Sources have said that Mission: Impossible star Cavill will play Sherlock Holmes, with The Crown's Bonham Carter set to play Enola and Sherlock's mother.
There are no details on Shaw's character at present. The film will see her reunite with Killing Eve director Harry Bradbeer.
Cork-born Shaw, who recently won the BAFTA for Best Supporting Actress for her work on Killing Eve, will next be seen on cinema screens opposite Saoirse Ronan and Kate Winslet in the romantic drama Ammonite.