Death has a unique smell. I've been in the presence of people who have killed; I've been in rooms where people have been killed. I've seen the unspeakable things human beings are capable of. None of that puts me off my aim; I want to see those people caught, convicted and sent to jail.

Mark Williams-Thomas is a former police detective and multi-award-winning investigative journalist. He has been at the centre of some of the most high-profile investigations of recent years involving killers and paedophiles.

In this gripping and unflinching book, Mark reveals how he has pieced together these complex cases. Through tireless research and perseverance, Mark takes us on a journey of discovery gathering and pursuing new evidence, earning the trust of silent witnesses and sharing the personal toll this extraordinary job takes on him.

Mark's story is a relentless and inspiring one; it is the story of a life dedicated to justice.