Called in to investigate the disappearance of a young couple during a violent storm, Paula Maguire, forensic psychologist, has mixed feelings about going back to Bone Island. Her last family holiday as a child was spent on its beautiful, remote beaches and returning brings back haunting memories of her long-lost mother.

It soon becomes clear that outsiders aren't welcome on the island, and with no choice but to investigate the local community, Paula soon suspects foul play, realising that the islanders are hiding secrets from her, and each other.

With another storm fast approaching, Paula is faced with a choice. Leave alive or risk being trapped with a killer on an inescapable island, as the blood tide rushes in...