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.

As dusk approaches a small Dublin suburb in the summer of 1984, mothers begin to call their children home. But on this warm evening, three children do not return from the dark and silent woods. When the police arrive, they find only one of the children gripping a tree trunk in terror, wearing blood-filled sneakers, and unable to recall a single detail of the previous hours. Twenty years later, the found boy, Rob Ryan, is a detective on the Dublin Murder Squad and keeps his past a secret.

In a peaceful retirement village, four unlikely friends meet weekly in the Jigsaw Room to discuss unsolved crimes; together, they call themselves the Thursday Murder Club. When a local developer is found dead with a mysterious photograph left next to the body, the Thursday Murder Club suddenly find themselves in the middle of their first live case.

Northern Ireland, spring 1981. Hunger strikes, riots, power cuts, a homophobic serial killer with a penchant for opera, and a young woman’s suicide that may yet turn out to be murder: on the surface, the events are unconnected, but then things—and people—aren’t always what they seem. Detective Sergeant Duffy is the man tasked with trying to get to the bottom of it all. It’s no easy job—especially when it turns out that one of the victims was involved in the IRA but was last seen discussing business with someone from the loyalist Ulster Volunteer Force.

For three years, Detective Jude Fontaine was kept from the outside world. Held in an underground cell, her only contact was with her sadistic captor, and reading his face was her entire existence. Learning his every line, every movement, and every flicker of thought is what kept her alive. After her experience with isolation and torture, she is left with a fierce desire for justice - and a heightened ability to interpret the body language of both the living and the dead.