EW.com:

DC’s titular Man of Steel, Henry Cavill, will now star as Sir Arthur Conan Doyle’s iconic character in Enola Holmes, which stars Stranger Things Millie Bobby Brown as the titular character, EW has learned.

The film, a production from Legendary, is an adaptation of author Nancy Springer’s book series The Enola Holmes Mysteries, about the adventures of budding detective Enola, Sherlock and Mycroft Holmes’ much younger sister. The first book, The Case of the Missing Marquess, came out in 2006.

Interesting to me that Legendary has their fingers in the pies of both this film and the Robert Downey Jr. Sherlock Holmes series, which they keep threatening will have a third installment.