Cast members have gathered in the U.K. as production gets underway. Here's what you need to know about the next installment.

Mary Parent, Ali Mendes, and Alex Garcia are producing Enola Holmes 3 for Legendary Entertainment, with Millie Bobby Brown and Bobby Brown producing for Brown’s production company PCMA Productions. Jake Bongiovi and Isobel Richards will executive produce for PCMA.

The film is directed by Philip Barantini, the filmmaker who most recently helmed Netflix’s breakout hit series “Adolescence.” Meanwhile, Jack Thorne, who wrote the first two “Enola Holmes” films, returns to pen the third, once again based on “The Enola Holmes Mysteries” by Nancy Springer.