The 53-year-old Ocean’s 8 actress and the 15-year-old Stranger Things star will both be starring in the upcoming film Enola Holmes, THR reports.
Harry Bradbeer is directing the adaptation of the Enola Holmes Mysteries book series by Nancy Springer.
The six-book series, which started with “The Case of the Missing Marquess” in 2006, focuses on “Sherlock and Mycroft Holmes’ much younger sister, Enola, who turns out to be a highly capable detective in her own right.”
Millie will play Enola, and Helena will play her mother.
Millie is also producing along with her sister Paige Brown.
Enola Holmes is set for a 2020 release!