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Lauren Teague is a beautiful, defiant, borderline-delinquent teenager when her parents bring her to Alex Delaware's office. But for all Alex's skill and effort, Lauren resists—angrily, provocatively. Reluctantly, the psychologist chalks Lauren up as one of the inevitable failures of a challenging profession. But years later, when Alex encounters Lauren as a stag party's featured entertainment, both doctor and patient are stricken with shame.

When a battered suitcase containing the dismembered body of a young man washes up on the shore of the river Thames, Detective Erika Foster is shocked. She's worked on some terrifying cases but never seen anything like this before. As Erika and her team set to work, she makes the link with another victim - the body of a young woman dumped in an identical suitcase two weeks ago. Erika quickly realizes she's on the trail of a serial killer who's already made their next move.

When Detective Erika Foster receives a tip-off that key evidence for a major narcotics case was stashed in a disused quarry on the outskirts of London, she orders for it to be searched. From the thick sludge the drugs are recovered, but so is the skeleton of a young child. The remains are quickly identified as seven-year-old Jessica Collins. The missing girl who made headline news 26 years ago.

When a young boy discovers the body of a woman beneath a thick sheet of ice in a South London park, Detective Erika Foster is called in to lead the murder investigation. The victim, a beautiful young socialite, appeared to have the perfect life. Yet when Erika begins to dig deeper, she starts to connect the dots between the murder and the killings of three prostitutes, all found strangled, hands bound, and dumped in water around London.