A red-haired girl's severed head is found in an ancient bog in south-east Galway, Ireland. A gruesome historical relic? Or something altogether disturbing?

As archaeologist Cormac Maguire and pathologist Nora Gavin investigate, they uncover more than the secrets of Drumcleggan Bog. Two years ago, beautiful Mina Osborne disappeared, along with her young son - and now the case is opened again.

Somewhere there is a killer, who wants the dead to stay buried and the missing to remain undiscovered.

And as Cormac and Nora get closer to the truth, answers from the past are leading to a murder in the future …