Joseph O'Loughlin appears to have the perfect life - a beautiful wife, a loving daughter and a successful career as a clinical psychologist.But nothing can be taken for granted. Even the most flawless existence is only a loose thread away from unravelling.All it takes is a murdered girl, a troubled young patient and the biggest lie of his life.Caught in a complex web of deceit and haunted by images of the slain girl, he embarks upon a search that will take him from London to Liverpool and into the darkest recesses of the human mind.Ultimately, he will risk everything to unmask the killer and save his family.