The Caves

On the evening of the last Thursday in October 2017, the town of Criccieth in north Wales is stricken by a ferocious storm.

Kelly Glover is alone in her aunts first floor flat, waiting for her husband, Ray, who is travelling from Manchester, to arrive. Contact with the outside world is a problem: the flat has no landline and the mobile phone signal varies between tenuous and unattainable.

Late evening and Ray hasn't arrived.

On Friday morning a chilling event occurs; it's the beginning of a complex investigation for the police.