When a missing person is found dead in North London, investigators discover the sadistic killer has already struck before. Iuliana Tudos was a popular 22-year-old who disappeared on Christmas Eve. Her friends launched a frantic search and discovered her mutilated body themselves. In a shocking twist, the police were able to link her killer to an unsolved murder from weeks earlier – where a retired civil servant was found bound and gagged in her own bedroom. (thetvdb.com)