A woman is found at dead at the bottom of a remote hillside having been half eaten by a mountain lion. Langston notes the ligature bruising that would indicate she was restrained and found a false feline tooth at the scene. They I.D the woman as a social worker and find she left her job and boyfriend just six weeks prior after intense therapy sessions with Lady Heather; who is now a certified sex therapist. Langston and Sara go to see Heather and discover the victim went through role playing therapy where she pretended to be a cat in order to get the affection she longed for. Unfortunately it became an obsession for her and ventured into the world of becoming a "human pet". Langston finds the dentist who made the cat tooth for the victim and his house is filled with "human pets". The victim had left her life behind to the dismay of her co-worker and friend who went to the dentist's home to snap her out of it but ended up accidentally killing her in the process. Nick and Dr. Robbins find a teenager hung in her bedroom and realize she is pregnant and the baby is still alive. Dr. Robbins performs and emergency C-section in the girl's bedroom and saves the baby girl. Nick notifies the girl's mother, who knew nothing about the pregnancy, and wants nothing to do the granddaughter and when he tracks down the teenage father of the baby he said he told the girl the day she died that he didn't want the baby. Nick is pained by the idea the baby will have no one and looks into the suicide as a possible murder when it is found the girl had been cyber-bullied by several popular girls at the high school once she started dating the teenage father. Nick is determined to bring justice for the young victim who felt so alone in the world that she took her own life and almost her babies. Ecklie helps Nick get the evidence needed to arrest the bullies for murder and Nick finds that the baby's father, while overwhelmed and scared, is willing to take responsibility and raise his little girl.
Langston seeks out Lady Heather sensing she can help him in his search for Nate Haskell. Lady Heather tells him the only way he can find Haskell is by getting in touch with the darkside he has been trying to hold back for years.