Armed with evidence and bent on vengeance, Helen goes searching for the Clarks. As the conspiracy starts to unravel, she has a deadly decision to make.

Cast: Keira Knightley, Ben Whishaw, Sarah Lancashire, Andrew Buchan, Andrew Koji, Omari Douglas, Kathryn Hunter, Sam Troughton, Ella Lily Hyland, Gabrielle Creevy, Isabella Wei, Adam Silver, Nathan Stewart-Jarrett, Hannah Khalique-Brown, Thomas Coombes, Molly Chesworth, Ken Nwosu, Finn Bennett