A grisly discovery is made deep in the Irish peat bog--the perfectly preserved severed head of a red-haired young woman. Has she been buried for decades, centuries, or longer? Who is she and why was she killed? American pathologist Nora Gavin and archaeologist Cormac Maguire are called in to investigate, only to find that the girl's violent death may have shocking ties to the present--including the disappearance of a local landowner's wife and son. Aided by a homicide detective who refuses to let the missing be forgotten, Nora and Cormac slowly uncover a dark history of secrets, betrayal, and death in which the shocking revelations of the past may lead to murder in the future.