The dead talk. To the right listener, they tell us all about themselves: how they lived, how they died - and who killed them. Val McDermid uncovers the secrets of forensic medicine with ground-breaking research and her own experience. Along the way you'll wonder at how maggots collected from a corpse can help determine time of death and how a DNA trace a millionth the size of a grain of salt can be used to convict a killer.