Three very different women come together to complete an environmental survey on the Northumberland countryside. Three women who, in some way or another, know the meaning of betrayal....For team leader Rachael Lambert the project is the perfect opportunity to rebuild her confidence after a double-betrayal by her lover and boss, Peter Kemp. Botanist Anne Preece, on the other hand, sees it as a chance to indulge in a little deception of her own. And then there is Grace Fulwell, a strange, uncommunicative young woman with plenty of her own secrets to hide.

It is a cold January morning, and Shetland lies beneath a deep layer of snow. Trudging home, Fran Hunter's eye is drawn to a splash of color on the frozen ground, ravens circling above. It is the strangled body of her teenage neighbor, Catherine Ross. The locals on the quiet island stubbornly focus their gaze on one man - loner and simpleton Magnus Tait.

After losing his leg to a land mine in Afghanistan, Cormoran Strike is barely scraping by as a private investigator. Strike is down to one client, creditors are calling, and after a breakup with his longtime girlfriend, he’s living in his office. Then John Bristow walks through his door with a shocking story: His sister, the legendary supermodel Lula Landry - known to her friends as the Cuckoo - famously fell to her death a few months earlier.

The story opens with the apparently accidental drowning of a sixth form student in the Norfolk countryside. As a matter of routine, or so it seems, the case passes across the desk of Detective Sergeant Smith, recently returned to work after an internal investigation into another case that has led to tensions between officers at Kings Lake police headquarters. As an ex-DCI, Smith could have retired by now, and it is clear that some of his superiors wish that he would do so.

DS George Cross can be rude, difficult and awkward with people. But his unfailing logic and dogged pursuit of the truth means his conviction rate is the best on the force. So when his police colleagues dismiss the death of a man as a squabble among Bristol's homeless community, Detective Sergeant George Cross is not convinced.