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 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.

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 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.

In Falls the Shadow, the second episode in series six of this compelling drama series, forensic clinical psychologist Dr Tony Hill (Robson Green) is brought in by Inspector Alex Fielding (Simone Lahbib) to uncover the identity of a serial murderer who is killing prostitutes and experimental psychologists in a very specific sequence. At first it looks as if the murders are unrelated - committed by two different serial killers - and the police are treating the murders of the prostitutes and psychologists as separate cases. But as the investigations unfold, Tony begins to see parallels between the motivations of both sets of murders, and using his understanding of the criminal mind, he reveals that it is in fact the same killer perpetrating both. Matters are complicated when Tony is arrested as a prime suspect in the case because of his friendship with the first murdered psychologist. He was the last to see her alive and traces of his blood are found in her hotel room. So did Tony really kill her, or is he telling the truth? Although Inspector Fielding comes to Tony's rescue, providing him with an alibi and refusing to accept that he is a murderer, another police inspector who believes in convicting purely on the basis of physical evidence has Tony thrown into jail. The fact that Tony has no motive for murdering his friend is disregarded. But when the killings continue while Tony is behind bars, it becomes clear that he can't be the murderer after all. So who is murdering prostitutes and experimental psychologists? Tony's psychological insights finally lead Inspector Fielding and the team to the murderer, but when Tony insists on confronting the murderer himself, he gets more than he bargained for. Will this be the end of Tony Hill?

In Falls the Shadow, the second episode in series six of this compelling drama series, forensic clinical psychologist Dr Tony Hill (Robson Green) is brought in by Inspector Alex Fielding (Simone Lahbib) to uncover the identity of a serial murderer who is killing prostitutes and experimental psychologists in a very specific sequence. At first it looks as if the murders are unrelated - committed by two different serial killers - and the police are treating the murders of the prostitutes and psychologists as separate cases. But as the investigations unfold, Tony begins to see parallels between the motivations of both sets of murders, and using his understanding of the criminal mind, he reveals that it is in fact the same killer perpetrating both. Matters are complicated when Tony is arrested as a prime suspect in the case because of his friendship with the first murdered psychologist. He was the last to see her alive and traces of his blood are found in her hotel room. So did Tony really kill her, or is he telling the truth? Although Inspector Fielding comes to Tony's rescue, providing him with an alibi and refusing to accept that he is a murderer, another police inspector who believes in convicting purely on the basis of physical evidence has Tony thrown into jail. The fact that Tony has no motive for murdering his friend is disregarded. But when the killings continue while Tony is behind bars, it becomes clear that he can't be the murderer after all. So who is murdering prostitutes and experimental psychologists? Tony's psychological insights finally lead Inspector Fielding and the team to the murderer, but when Tony insists on confronting the murderer himself, he gets more than he bargained for. Will this be the end of Tony Hill?

In From The Defeated, the third episode in series six of this compelling crime drama, forensic clinical psychologist Dr Tony Hill (Robson Green) is brought in by Inspector Alex Fielding (Simone Lahbib) to investigate a series of kidnappings and murders where it appears that the victims were also killers. The body of the first victim, a young male, poses a riddle. He was beaten, strangled and shot in the head. Why were all three methods of murder necessary? When a second victim is found who's mysteriously linked to the first only by the presence of skin under his fingernails, the answer seems to be that the two young men had no connection other than in death. One victim killed the other. But who killed the survivor? As more victims emerge, Tony begins to piece together a bizarre chain of attacks in which killer becomes victim in a grotesque survival of the fittest challenge. The gun in each case apparently belongs to the same person - an illegal dogfight promoter who claims the weapon was stolen some time ago - but is it him who has abandoned dog fighting and moved onto humans? Meanwhile, someone is stalking a young single mother living in a remote country cottage. The woman's complaints are dismissed by the local police, and it is only Tony who realises that she is related to the other murder victims, and that she will play out the final act in the murderer's dark master plan. Tony faces another challenge when Michael - the cannibal psychiatrist he helped to convict in Unnatural Vices - manages to escape from jail by murdering the prison chaplain, suffocating him with the pages from his own Bible, and then disguising himself in the chaplain's clothes. Michael is back out on the loose, and Tony knows that he will kill again. When a Bible passage is left pinned to Tony's windscreen, and Tony receives a phone call from Michael, his worst fears are confirmed. Will Tony be Michael's next victim?

In From The Defeated, the third episode in series six of this compelling crime drama, forensic clinical psychologist Dr Tony Hill (Robson Green) is brought in by Inspector Alex Fielding (Simone Lahbib) to investigate a series of kidnappings and murders where it appears that the victims were also killers. The body of the first victim, a young male, poses a riddle. He was beaten, strangled and shot in the head. Why were all three methods of murder necessary? When a second victim is found who's mysteriously linked to the first only by the presence of skin under his fingernails, the answer seems to be that the two young men had no connection other than in death. One victim killed the other. But who killed the survivor? As more victims emerge, Tony begins to piece together a bizarre chain of attacks in which killer becomes victim in a grotesque survival of the fittest challenge. The gun in each case apparently belongs to the same person - an illegal dogfight promoter who claims the weapon was stolen some time ago - but is it him who has abandoned dog fighting and moved onto humans? Meanwhile, someone is stalking a young single mother living in a remote country cottage. The woman's complaints are dismissed by the local police, and it is only Tony who realises that she is related to the other murder victims, and that she will play out the final act in the murderer's dark master plan. Tony faces another challenge when Michael - the cannibal psychiatrist he helped to convict in Unnatural Vices - manages to escape from jail by murdering the prison chaplain, suffocating him with the pages from his own Bible, and then disguising himself in the chaplain's clothes. Michael is back out on the loose, and Tony knows that he will kill again. When a Bible passage is left pinned to Tony's windscreen, and Tony receives a phone call from Michael, his worst fears are confirmed. Will Tony be Michael's next victim?

In The Dead Land, the fourth and last episode in series six of this compelling crime drama, forensic clinical psychologist Dr Tony Hill (Robson Green) is brought in by Inspector Alex Fielding (Simone Lahbib) to uncover the identity of a killer who is murdering homeless men in a ritualistic fashion. The nature of the murders is unusual. The killer is feeding, bathing and wrapping the victims in paper and salt, stabbing them through the heart, and then dumping their bodies around the financial district of Bradfield. When Alex is called away to the funeral of her mother, she is replaced by a fast-tracked SIO with a degree in psychology from Oxbridge. Tony is at first resentful of this young gun, but as they work together on the killer's motive he finds he is impressed. Mentor and pupil agree that the careful way in which each body has been treated suggests a ritual element in the deaths. When Tony goes out for dinner at a Sushi eatery he finally makes the connection - the ritual killings have a Japanese inspiration. An unusual witness then posthumously leads the team to a suspect who seems like the killer in every way - but a final twist reveals the true identity of the murderer. Meanwhile, Tony becomes aware that someone is stalking him. Could it be the psychopathic cannibal psychiatrist Michael, who Tony helped convict and who has recently escaped from prison? Tony is placed under police protection, but insists on continuing with his police work. Tony is unaware that his own life is about to take a plunge into violence. Michael is not finished with him yet...

In The Dead Land, the fourth and last episode in series six of this compelling crime drama, forensic clinical psychologist Dr Tony Hill (Robson Green) is brought in by Inspector Alex Fielding (Simone Lahbib) to uncover the identity of a killer who is murdering homeless men in a ritualistic fashion. The nature of the murders is unusual. The killer is feeding, bathing and wrapping the victims in paper and salt, stabbing them through the heart, and then dumping their bodies around the financial district of Bradfield. When Alex is called away to the funeral of her mother, she is replaced by a fast-tracked SIO with a degree in psychology from Oxbridge. Tony is at first resentful of this young gun, but as they work together on the killer's motive he finds he is impressed. Mentor and pupil agree that the careful way in which each body has been treated suggests a ritual element in the deaths. When Tony goes out for dinner at a Sushi eatery he finally makes the connection - the ritual killings have a Japanese inspiration. An unusual witness then posthumously leads the team to a suspect who seems like the killer in every way - but a final twist reveals the true identity of the murderer. Meanwhile, Tony becomes aware that someone is stalking him. Could it be the psychopathic cannibal psychiatrist Michael, who Tony helped convict and who has recently escaped from prison? Tony is placed under police protection, but insists on continuing with his police work. Tony is unaware that his own life is about to take a plunge into violence. Michael is not finished with him yet...