DI Ruth Hunter has resolved to put the grief of her missing partner behind her and continue to make a life away from London in Snowdonia. When a young couple disappear after a brutal murder, she realises the two are connected.

As Ruth and her CID team scour Snowdonia for the runaways, she realises that she is dealing with two fragile, vulnerable young people – not dangerous criminals. With time running out, Ruth uncovers a history of abuse, betrayal and tragedy. Can she find the couple before they ruin their lives forever?