Kara, a Russian spy and Adam's former lover, reveals she orchestrated Angelis's poisoning to force Adam into power so she could use his new top-level access. Principal Cast Charlie Cox Adam Lawrence Newly appointed acting head of MI6. Olga Kurylenko Kara Yusova A former Russian SVR operative seeking intelligence. Oona Chaplin Maddy Lawrence Adam's wife and a former army officer. Ciarán Hinds Sir Martin Angelis The hospitalized former chief of MI6. Tracy Ifeachor Dede Alexander A CIA agent and Maddy's former military friend. Summary of Key Events

Sir Martin Angelis is hospitalized after drinking poisoned whiskey at a club. Adam Lawrence, his deputy, is immediately elevated to lead the agency.

After Adam tells Kara to leave him alone, his daughter Ella is kidnapped, forcing him to reach out to Kara for help as the episode concludes.

Watch the official trailer for Treason to see the intense atmosphere of the series' opening episode: