As the first details emerge of the action movie, the famed author's estate is claiming that a game is afoot.

'Enola Holmes' will see 'Stranger Things' star Millie Bobby Brown have the crime-solving hat passed down to her as she plays Sherlock Holmes' younger sister. The 16-year old winds up finding herself under the care of her two older brothers, Sherlock and Mycroft, and decides to embark on a journey of her own to track down her missing mother by following her clues.

Joining Millie Bobby Brown in 'Enola Holmes' is quite the A-List cast. Helena Bonham Carter (every Tim Burton movie under the sun) will play her mother who mysteriously disappears, Henry Cavill ('The Witcher' and Superman in 'Batman v Superman') plays a chiselled Sherlock, while Sam Claflin ('Me Before You' and 'Love Wedding Repeat') will play the role of their brother Mycroft.

However, the film has been shrouded in controversy, as the estate of the late Arthur Conan Doyle has sued Netflix for this new interpretation. The loosely-adapted work is based on the books by US author Nancy Springer, who has a series of novels under the name 'The Enola Holmes Mysteries', and the author is also being sued, alongside her publisher Penguin Random House, and producers of the film, Legendary.

The estate claim that the Netflix and Springer version of Sherlock Holmes in the film is a copyright infringement, as this version of the sleuth shows too many emotions. They argue that Holmes' emotional side was a late addition to the character, which features in books that are not yet in the public domain, and which they own. Famed for being quite stoic, the Doyle estate says that only after Arthur Conan Doyle returned to write more Sherlock Holmes novels that he then added these new character traits.

The Doyle estate famously lost most of its hold on the Sherlock Holmes series in 2014, and this new lawsuit is directed at the last 10 original stories which were written between 1923 and 1927. In 2015, another lawsuit was filed against Miramax for Ian McKellen's 'Mr. Holmes', which was later settled.

'Killing Eve' star Fiona Shaw will also join the cast of 'Enola Holmes', as well as Adeel Akhtar from 'Four Lions', Frances de la Tour from 'Harry Potter', and Susie Wokoma from 'Chewing Gum'.

In amongst the controversy, Netflix has released the first images of the film.

'Enola Holmes' is due to hit Netflix this September, as long as the lawsuit doesn't hold up its release.