A promidate from 20th Century Studios boss Steve Asbell details the next All three Poirot movies from the studio have received relatively fresh reviews on review aggregator site Rotten Tomatoes and have made $612 million at the global box office, leaving the door open to more adaptations of Christie’s revered novels.
Speaking with The Hollywood Reporter, Asbell spoke about the prospect of more adaptations of Christie’s work. He revealed that the next three adaptations will be based on And Then There Were None, Witness for the Prosecution, and Miss Marple. Asbell also said that there are “a bunch of other titles” in the works. No further details have been revealed, so it's unclear whether Branagh will return to direct any of them. Read Asbell’s full comment below:
More, yes. We have And Then There Were None. We have Witness for the Prosecution. We’re doing Miss Marple. There’s a bunch of other titles that we’re working on. We have very close relationship with the estate.
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Unless the creative team makes significant changes from the books, viewers shouldn’t expect Branagh as Hercule Poirot in these announced adaptations. The detective doesn’t appear in And Then There Were None or Witness for the Prosecution, and never meets the titular Miss Jane Marple in any of Christie's books. He might return to direct, but those chances seem less likely since he probably wouldn't star in any of the adaptations.

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The most intriguing tidbit of information here is the adaptation of And Then There Were None. As with any of Christie’s best works, the novel has been adapted numerous times for both the big and small screen, most notably the 1945 adaptation, which still has 100% on Rotten Tomatoes, and the 2015 limited series by the BBC starring Charles Dance. Expectations will be high, but if 20th Century Studios takes its time, it can create a thrilling project that can match or even sur what came before.
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As a fan of Christie’s And Then There Were None, I’m most excited about this adaptation, as it will, like most movies based on Christie’s work, serve as a proper exhibition of talent from its ensemble cast. Branagh’s movies have so far reached high for this, as each movie involves a boastful cast full of established and up-and-coming talent, like Branagh himself as Poirot or Kyle Allen as Maxime Gerard in A Haunting in Venice. Whether or not Branagh’s returning to direct, these adaptations of Christie’s work are highly anticipated.
Source: THR