Volume 5 When a decayed skeleton is found buried under the patio of a derelict North London house, Walker is incensed at having to deal with such a mundane case. But when two more skeletons are found - one with a distinctive belt around the neck - it seems a serial killer's work has been uncovered. Faced with a media scrum and the chance to resurrect his fading career, the pressure is on for Walker. But with little forensic evidence and no clear indication of when the crimes were committed, Walker knows that his time may soon also be up. Volume 6 When a young mother is abducted from a local wood, a trail of evidence leading back to a wealthy local businessman makes North think she has got her man. But when his brother - a known sex offender -claims responsibility, she is faced with deciphering a string of complex motivations for murder, without even a body for evidence. Meanwhile, as Walker prepares to be interviewed for his dream job as Commander, his ex wife is savagely beaten by her new boyfriend, leading Walker into a violent standoff with a shocking and explosive climax Volume 7 The discovery of a severed female hand in the Thames is the start of a gruesome murder hunt. DCI Roisin O'Connor (Victoria Smurfit) is the investigating officer, leading to a hostile reunion with the newly demoted Walker, whom she is deeply dubious of following his recent misdemeanours. Tackling an apparently perfect murder for which there isn't even a body, the pair lock horns in what becomes a high stakes battle of pride and wits. Volume 8 When a beautiful young prostitute plunges to her death from the balcony of a smart apartment block, Walker and O'Connor are thrust into the shadowy and hard-edged realm of the wealthy elite. And when she is discovered to be the daughter of a 1970's TV star who was also murdered some ten years before, an investigation begins that spans thirty years and probes a murky underbelly of murder, secrets and paid for sex. It soon becomes clear that mother and daughter shared more than just good looks and a taste for high living.