A stolen baby. A murdered woman. A decades-old atrocity. Something connects them all.

A month before Christmas, and Ballyterrin on the Irish border lies under a thick pall of snow. When a newborn baby goes missing from hospital, it's all too close to home for forensic psychologist Paula Maguire, who's wrestling with the hardest decision of her life.

Then a woman is found in a stone circle with her stomach cut open and it's clear a brutal killer is on the loose.

As another child is taken and a pregnant woman goes missing, Paula is caught up in the hunt for a killer no one can trace, who will stop at nothing to get what they want.