DI Murphy and DS Rossi

The young girl you have found isn't the first experiment I've carried out. She won't be the last. A tense, unpredictable crime debut that will not only have you gripped, but will chill you to the bone. Perfect for fans of Stuart MacBride and Mark Billingham. A serial killer is stalking the streets of Liverpool, gruesomely murdering victims as part of a series of infamous, unethical and deadly psychological experiments.

A university student is murdered and attached to her body is a letter from her killer, detailing a famous unethical psychological experiment, an experiment that the killer had replicated on the victim, resulting in her death. Detectives Murphy and Rossi initially dismiss the letter as a bid to throw them off the scent - until more bodies are found, each with their own letter attached. The detectives realize they're chasing a killer who doesn't just want his victims' bodies, but their minds as well.

Once inside…there's no way out. A fate worse than death…DI Murphy and DS Rossi discover the body of known troublemaker Dean Hughes, dumped on the steps of St Mary's Church in West Derby, Liverpool. His body is covered with the unmistakable marks of torture. As they hunt for the killer, they discover a worrying pattern. Other teenagers, all young delinquents, have been disappearing without a trace. Who is clearing the streets of Liverpool?

Social media stars Chloe Morrison and Joe Hooper seem to have it all - until their bodies are found following an anonymous phone call to their high-profile agent. They are tied and bound to chairs facing each other, and their violent deaths cause a media scrum to descend on Liverpool, with DI David Murphy and DS Laura Rossi assigned to the case. It quickly becomes clear that the killer believes secrets and lies within relationships should have deadly consequences....

Tim Johnson took his baby daughter out for a walk, and she never made it home. Johnson claims he was assaulted and the girl was snatched. The police see a different crime, with Johnson their only suspect. A year later, Sam Bryne is on course to be elected as one of the youngest MPs in Westminster. He's tipped for the very top...until he vanishes. Detectives Murphy and Rossi are tasked with discovering what has happened to the popular politician - and in doing so, they unearth a trail that stretches into the past....