Dr. Tony Hill (Robson Green) is a clinical psychologist with an extraordinary understanding of the criminal mind. Working alongside detective inspector Alex Fielding (Simone Lahbib), Tony must race against time to profile and track down vicious murderers before they strike again.

Disc 1 - The Colour Of Amber
When a woman sees a young girl being snatched by a man in a car, Detective Inspector Alex Fielding fears they may only have hours to get her back alive. Will Tony be able to find the abductor in time?

Disc 2 - Nocebo
Alex investigates the murder of two children, who bear signs of ritual killings. Tony puzzles over what the killer might want to gain and why. And is it one killer or two?

Disc 3 - The Names Of Angels
Two women are found raped and strangled, wearing the clothing of victims killed years earlier in Europe. As Tony tries to unravel the deadly puzzle, he's confronted by an unpleasant distraction - an 18-year-old released killer turns up on his doorstep.

Disc 4 - Anything You Can Do
When a vulnerable elderly woman is suffocated in her home, Alex and Tony suspect a security guard who was seen at the scene of the crime by several witnesses. But when the killings escalate, it appears to be the work of more than one murderer.