When a spy posing as a politician's wife learns her lover has been murdered, an old assassin friend joins her on a quest for truth — and vengeance.

Keira Knightley, Ben Whishaw, Sarah Lancashire, Andrew Buchan, Andrew Koji, Kathryn Hunter, Sam Troughton, Ella Lily Hyland, Ken Nwosu, Gabrielle Creevy, Adam Silver, Omari Dougles, Tracey Ullman, Luther Ford, Finn Bennett, Adeel Akhtar, Omari Douglas