The young girl you have found isn't the first experiment I've carried out. She won't be the last. A serial killer is stalking the streets of Liverpool, gruesomely murdering victims as part of a series of infamous unethical and deadly psychological experiments. When it becomes apparent that each victim has ties to the City of Liverpool University, DI David Murphy and DS Laura Rossi realise they're chasing a killer unlike any they've hunted before - one who doesn't just want their bodies, but wants their minds.