was her with her final words but she dies in the process as the bomb goes off seconds later. In the fourth episode of the eighth series, Oleg Darshavin, who had been one of Lucas's interrogators in Russia, approaches him for help in stopping a planned bombing by Sudanese extremists; Lucas takes the case despite Harry's suspicion that he developed Stockholm syndrome during his captivity. Harry's suspicions are solidified when Lucas goes off-piste, but ultimately, Lucas is able to bring Darshavin in and takes him into FSB custody after uncovering his involvement in the plot, while Ros stops the bomb. During the same series, Lucas conducts an affair with CIA liaison Sarah Caufield (Genevieve O'Reilly), who is later revealed to be an operative of "Nightingale", a multinational shadow organisation bent on a New World Order. When he discovers this and confronts Sarah about her involvement, she flees. She returns in the series eight finale, and before she is assassinated, she reveals that Nightingale is attempting to provoke a nuclear war between India and Pakistan. In the end, Lucas and Ros go to a hotel rigged to explode, set up by Nightingale, to save Pakistan President Mudasser and Home Secretary Andrew Lawrence before the building explodes; Lucas rescues Mudasser, who calls off the impending war, but Ros is killed in the explosion before she can get Lawrence to safety. In the ninth series, Harry reinstates Lucas as chief of Section D; this makes Lucas responsible for the integration of two new team members into the section, Beth Bailey (Sophia Myles) and Dimitri Levendis (Max Brown). Vaughn returns and hands Lucas a briefcase with possessions from his life before MI5, including photographs of him and Maya Lahan. When he visits her, however, she is so shocked at his reappearance and angry over his letting her believe him dead that at first she wants nothing to do with him. Later, Vaughn promises to leave Lucas alone in exchange for an MI5 file on "Albany"; Lucas eventually hands him what he believes is the file. Believing he is free from Vaughn, Lucas persuades Maya to restart their relationship. However, it is revealed the file was not Albany, though it leads to the location of the actual file. Vaughn forces Lucas to find the file, which is in the possession of former Section D member Malcolm Wynn-Jones (Hugh Simon). After convincing Malcolm to give him