It is a cold January morning and Shetland lies buried beneath a deep layer of snow. Trudging home, Fran Hunter's eye is drawn to a vivid splash of colour on the white ground, ravens circling above. It is the strangled body of her teenage neighbour Catherine Ross. The locals on the quiet island stubbornly focus their gaze on one man – loner and simpleton Magnus Tait. But when police insist on opening out the investigation a veil of suspicion and fear is thrown over the entire community. For the first time in years, Catherine's neighbours nervously lock their doors, whilst a killer lives on in their midst.

Three very different women come together at isolated Baikie’s Cottage on the North Pennines to complete an environmental survey. Rachael, the team leader, is still reeling after a double betrayal by her lover and boss, Peter Kemp. Anne, a botanist, sees the survey as a chance to indulge in a little deception of her own. And then there is Grace, a strange, uncommunicative young woman hiding plenty of her own secrets. 

In North Devon, where the rivers Taw and Torridge converge and run into the sea, Detective Matthew Venn stands outside the church as his father's funeral takes place. The day Matthew turned his back on the strict evangelical community in which he grew up, he lost his family, too. Now he's back, not just to mourn his father at a distance, but to take charge of his first major case in the Two Rivers region; a complex place not quite as idyllic as tourists suppose.

On a remote Highland mountain, the body of Elaine Buxton is burning. All that will be left to identify the respected lawyer are her teeth and a fragment of clothing. In the concealed back room of a house in Edinburgh, the real Elaine Buxton screams into the darkness…. Detective Inspector Luc Callanach has barely set foot in his new office when Elaine’s missing persons case is escalated to a murder investigation. Having left behind a promising career at Interpol, he’s eager to prove himself to his new team.

When she's not digging up bones or other ancient objects, Ruth Galloway lectures at the University of North Norfolk. She lives happily alone in a remote place called Saltmarsh overlooking the North Sea and, for company; she has her cats Flint and Sparky, and Radio 4. When a child's bones are found in the marshes near an ancient site that Ruth worked on ten years earlier, Ruth is asked to date them.