The series spans six novels, revolving around mysteries investigated by Sherlock and Mycroft Holmes' much younger sister, Enola, who proves to be a highly capable detective in her own right.
By comparison, Home Alone's Macaulay Culkin didn't venture into producing until 2013, with his self-explanatory short film Macaulay Culkin Eating a Slice of Pizza.
Brown broke out as Eleven in the Netflix series "Stranger Things", which earned her an Emmy nomination.
Stranger Things actress Millie Bobby Brown may be venturing into real film star territory very soon.
Brown is already familiar with Legendary, given that she co-stars in 2019 MonsterVerse movie Godzilla: King of Monsters alongside Sally Hawkins (The Shape of Water), Vera Farmiga (Bates Motel), and Bradley Whitford (The West Wing, Get Out).
The book series began with the 2006 title The Case of the Missing Marquess. With Brown, one of the most promising and charismatic actors of her generation, at the helm, this could be a big series for Legendary and for Brown. SAG also nominated Brown in the supporting actress category for her performance.