The psychological thriller is based on Rosamund Lupton's bestselling novel, The Wrap reported, which is represented by Emily's own sister, literary agent Felicity Blunt.
The Devil Wears Prada actress, 30, will star as Beatrice, who, convinced her younger sister has been murdered, investigates her death and apparent suicide.
The British actress recently filmed action movie Edge Of Tomorrow with Tom Cruise, and Disney's Into The Woods, alongside Johnny Depp, Meryl Streep and James Corden.
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