Emily Fraser (Nicola Stephenson) was the main villainess from "London Underground," episode 11.05 of New Tricks (airdate 15 September 2014). She is the daughter of filmmaker Edward Fraser and the assistant to another filmmaker, David Straka.
Emily was encountered by DCI Sasha Miller and Gerry Standing regarding Straka's death from drowning at a river known as The Fleet back in 1994, as well as the drowning of Straka's other assistant, Oliver Houghton, in the episode's events. The investigation's progression led UCOS to an inadvertent encounter with Cyril Watkins, who had undergone a sex change and became Cecily Watkins, and had also assaulted Sasha at a pub. During her interrogation, Cecily revealed that Emily had seen a film that showed the death of a woman, the same film that both Straka and Houghton had seen.
This led to another encounter with Emily, who voiced her hatred of Cecily since Straka's death, and even claimed that Cyril/Cecily was the killer. After Gerry and Steve McAndrew found remains in a sewer, it was correctly concluded that they were the remains of the woman in the video, who was revealed as Alice Unsworth. Alice was revealed as the mother of Emily Fraser, with the reveal coming after Steve uncovered Edward as the director of the film, as well as both of them having tattoos that revealed their affiliation with the occult. During UCOS' confrontation with Edward (who suffered from dementia), Emily entered and was eventually revealed as a murderess.
Emily stated that she had believed that her mother was killed in an accident when she was a toddler, until David showed her the film. She angrily confronted Edward, who claimed that he and Alice were into drugs and magic, adding that Alice wasn't supposed to die. Emily did not kill Straka, as she had heard about his death the next day, as well as the clip being missing. As it turned out, Houghton had the video and contacted Emily during the episode's events, demanding money from Emily under the threat of making the video of her parents public. Knowing that the video's release would result in Edward facing possible charges, the evil Emily killed Houghton by drowning him in The Fleet. After confession, the deranged villainess ranted that The Fleet "needed more blood," and while UCOS' tended to Edward, Emily left the house and went to the bridge, where the group spotted her. Emily continued her maniacal rant, stating that the river wanted more blood and that she wanted to see her (Alice) again, right before she jumped to her death.