The spy-assassin duo you didn't know you needed. Keira Knightley and Ben Whishaw team up in Black Doves, a six-part spy thriller set at Christmas. Watch all episodes, also starring Sarah Lancashire, from December 5.<br /><br />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.
