After failing to apprehend the terrorist behind a Paris attack that claimed dozens of lives, CIA agent Alice Racine is forced to live in London as a caseworker. Her mentor unexpectedly calls her back into action when the CIA discovers that another attack is imminent. Alice soon learns that the classified information she's uncovered has been compromised...

Series 11 follows the Thirteenth Doctor as she initially searches for her lost TARDIS, inadvertently bringing Graham, Ryan, and Yasmin with her on her travels. All three later contemplate returning to their normal lives but decide to continue travelling with the Doctor.