In the seventh series, which takes place six months after series six, Ros is revealed to be working in Moscow as "Range Finder", to bring intelligence back to London which reveals a planned attack during a Remembrance Day ceremony. Adam finds a car rigged to explode and drives it to an unpopulated zone, but dies as he exits the exploding car. In the next episode, Harry promotes Ros to succeed Adam as Chief of Section D. In later episodes of the series, Ros works to uncover an FSB mole within the section, who is attempting to sabotage "Sugar Horse", a top secret MI5 operation involving the recruitment of Russians into top government positions, and therefore, become aware of Russia's intentions towards the United Kingdom. Ros and the team later discover the mole is Connie James (Gemma Jones), and she is arrested. However, in the finale, she and Lucas North (Richard Armitage) are forced to use her help when they discover "Tiresius", Russia's equivalent of Sugar Horse, has planted a nuclear bomb in London. After finding the bomb, Connie disarms it, but dies in the process.