 Tahar Rahim and Gillian Anderson were cast during the 2016 Berlin International Film Festival.However by June 2017, filming had yet to begin, and cast member Anderson stated she had not heard anything about the project since being cast.By January 2018, the project was redeveloped once more, with Gavin Hood now set to direct in place of Justin Chadwick, and Keira Knightley and Matt Smith cast in February, replacing the previous cast.