S01:E12 - Episode 12
When Bridget falls ill, some suspect her drug-using party lifestyle is to blame. As her symptoms worsen, however, Bridget becomes convinced that her flatmate, Diana, is trying to poison her.
S01:E13 - Episode 13
Convinced that he has solved the mystery of his wife and son's murder, Spence feels free to explore a relationship with an ex-patient, Diana. Diana is later revealed to be the serial killer.