In January 2015, The Hollywood Reporter stated that numerous actresses, including Tatiana Maslany, Rooney Mara, and Felicity Jones were being tested for the film's lead.
I januar 2015 rapporterede The Hollywood Reporter, at en række skuespillerinder, herunder Tatiana Maslany, Rooney Mara og Felicity Jones, var til prøve for filmens hovedrolle.