Watch the very first trailer for Netflix's new movie about Sherlock Holmes' younger sister

It turns out the world-famous detective Sherlock Holmes has a younger sister - and she’s feisty!

At least he does in Netflix’s upcoming movie Enola Holmes.

The streaming service unveiled he very first trailer for the new action-comedy flick today, and it looks like a lot of fun!

British actress Millie Bobbie Brown - who you may recognise from the hit Netflix series Stranger Things - stars in the movie as Enola, who wakes up on her 16th birthday to discover that her mother, played by The Crown’s Helena Bonham Carter, has vanished.

Taking after her older brothers - Sherlock Holmes, who is portrayed by The Witcher’s Henry Cavill, and Mycroft Holmes played by The Hunger Games star Sam Claflin - Enola puts her sleuthing skills to the test to not only find her mother but uncover a "conspiracy that threatens to set back the course of history."

Set in 1884, the film is based off the book series by author Nancy Springer, the Enola Holmes Mysteries, which reimagines the works of Arthur Conan Doyle.

Enola Holmes is set to stream on Netflix on September 23.