Professor Leo Dalton, Dr Harry Cunningham and Dr Nikki Alexander return in one of the BBC's most successful and longest-running crime dramas. In this series Nikki becomes increasingly disturbed after carrying out the postmortem of a young girl and is asked to investigate a mysterious, ancient body that has been unearthed from a peat moor. The team also investigates two suspicious suicides - a young woman, pulled from a river near an army base and a soldier in training, shot in the face. As the police investigation builds, the team starts to wonder if these two deaths are linked...