Nadia Montgomery was a fourth-year-old worker at Lexington Bank who was persuaded by Mr Symington and Mr Blenkinsop to take a watch, also known as a Time Harvester. She was one of the first to realise that the watch wasn't supposed to be used.
Luckily, her watch broke, but it damaged her skin and she still wasn't able to remove it from her wrist. Nadia's watch caused her to age either older or younger until she became a ten-year-old. However, the Eleventh Doctor gave her a glass brick containing Sameera Jenkins's time which added ten years to her and gave her the appearance of a twenty-year-old. After this, she became the new runner for Lexington Bank. (PROSE: Borrowed Time)