The dead talk. To the right listener, they tell us all about themselves: where they came from, how they lived, how they died - and who killed them. Forensic scientists can use a corpse, the scene of a crime or a single hair to unlock the secrets of the past and allow justice to be done. Bestselling crime author Val McDermid draws on interviews with top-level professionals to delve, in her own inimitable style, into the questions and mysteries that surround this fascinating science.