A young woman’s body has been found on Hampstead Heath. Naked, tortured, mutilated. The violence visited upon her shocks even seasoned forensic pathologist Kate Walker.

And when DI Jack Delaney takes on the case, he realises that someone is taunting him with the horrific murder. Then, in a North London flat, the expertly dissected body of a second young woman is discovered. There is no apparent connection between the victims, but it becomes clear that a psychopathic serial killer is on the loose - and that Kate Walker could be next in line.