Millie Bobby Brown stars as Enola Holmes in the brand-new trailer for the upcoming Netflix film.
The clip finds the Stranger Things star stepping into the shoes of Sherlock Holmes’ younger sister, who becomes an action hero of her own in the film.
Henry Cavill plays Sherlock himself, while Helena Bonham Carter plays their mother, who goes missing.
The trailer sees Brown breaking the fourth wall and speaking directly to the audience as she explains her determination to solve the mystery of her mother’s disappearance.
After her brother Mycroft demands she attend finishing school, Enola rebels, dressing as a boy to run away and track down her mother.
Familiar faces such as Fiona Shaw, Sam Claflin and Adeel Akhtar also feature in the trailer.
The film, based on the book series by Nancy Springer, will be released on Netflix on Wednesday, September 23.
The synopsis from Netflix reads: "On the morning of her 16th birthday, Enola Holmes (Millie Bobby Brown) wakes to find that her mother (Helena Bonham Carter) has disappeared, leaving behind an odd assortment of gifts but no apparent clue as to where she’s gone or why.
“After a free-spirited childhood, Enola suddenly finds herself under the care of her brothers Sherlock (Henry Cavill) and Mycroft (Sam Claflin), both set on sending her away to a finishing school for 'proper' young ladies.
Style File: Millie Bobby Brown - In pictures
"Refusing to follow their wishes, Enola escapes to search for her mother in London. But when her journey finds her entangled in a mystery surrounding a young runaway Lord (Louis Partridge), Enola becomes a super-sleuth in her own right, outwitting her famous brother as she unravels a conspiracy that threatens to set back the course of history."
Enola Holmes will be available to stream from Netflix on Wednesday, September 23