When farmers cutting turf in a peat bog make a grisly discovery -- the perfectly preserved severed head of a young woman with long red hair -- Irish archaeologist Cormac Maguire and American pathologist Nora Gavin team up in a case that will open old wounds. Peat bogs prevent decay, so the decapitated young woman could have been buried for two decades, two centuries, or even much longer. Who is she? When was she killed? The extraordinary find leads to even more disturbing puzzles. The red-haired girl is clearly a case for the archaeologists, not the police. Still, her tale may have shocking ties to the present, and Cormac and Nora must use cutting-edge techniques to preserve ancient evidence.