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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Someone will break a promise to you, which is disappointing. Don't let this setback stop you from crossing the finish line. You may have to submit an entry late or attend the last few minutes of a meeting, but take heart. Rallying in the midst of difficult circumstances will count in your favour. Someone else may get a job or scholarship, but you'll be in the running for the next opportunity. In the meantime, have an alternative plan ready when relying on others for help.More