In Unnatural Vices, the first episode in series six of this compelling drama series, clinical psychologist Dr Tony Hill (Robson Green) is brought in by Inspector Alex Fielding (Simone Lahbib) to reveal the identity of a grisly serial murderer who is ... (more)capturing, imprisoning, torturing and then eating his victims while they are still alive. When a young Kurdish girl goes missing, and her father confesses to her murder, it seems like a cut and dried case. But as it becomes clear that her father falsely confessed to protect his daughter's honour, Tony and Inspector Fielding are drawn into the dark world of sexual sadomasochism - the one element which seems to link several gruesome murder victims. After visiting a local S&M club, where the Madam provides some useful information about her regular clients, the pieces of the puzzle begin to fall into place. All of the victims were loners in need of a shoulder to cry on, and the modus operandi of torture and death is consistent in each case. So who is responsible? The local school teacher? The helpful psychiatrist? Or the husband of one of the victims who models shop mannequins and has a fascination with body parts? Meanwhile, DC Collins's girlfriend disappears and questions are being asked about his involvement - and why a leather whip Collins stole from the S&M brothel he'd been investigating was found in her apartment. Tony's psychological insights into the mind of a killer finally lead Inspector Fielding and the team to the murderer - as always, with a twist in the tale.