Helena Bonham Carter joins Millie Bobby Brown in 'Enola Holmes'

Actor Helena Bonham Carter has boarded the cast of Legendary Studios' film adaptation of "Enola Holmes" books.

The actor joins "Stranger Things" star Millie Bobby Brown in the project, to be directed by Harry Bradbeer, according to The Hollywood Reporter.

Author Nancy Springer has written the book series, which began with 2006's "The Case of the Missing Marquess in 2006".

Jack Thorne has penned the script.

The story is about Enola, the much younger sister of Sherlock and Mycroft Holmes who turns out to be a highly capable detective in her own right.

Carter, 53, will portray Enola's mother in the project.

Besides Legendary, Brown and her sister Paige Brown are producing the film through their banner PCMA Productions.