The detective is in charge of 'tracing' [=(more commonly) 'tracking down'] missing persons.
(..) in your power to get her back." And we are. It wasn't a collective "you". It was a singular "you", ie me. Sir, we may have something. Jamie's been tracing the video's origin. I thought it was untraceable. Algorithm. Anyway, we also know it was uploaded at .am. I ran a nationwide traceback (..)2011 TvShow: Black Mirror Title: The National Anthem Season: 1 Episode 1