Cormoran Strike and Robin Ellacott are back, and at odds following Robin's wedding to Matthew.
But there's no time to mull on the new distance within their professional relationship, as a frightening visit from a potential client puts a new case on the table - and Robin and Strike set to work looking into reports of a strangled child.
With the detective agency thriving, the duo are also recruited to investigate the blackmail of a Government Minister and Robin is tasked with going undercover in the House of Commons.
Strike and Robin's startling discovery seems to confirm the story of the strangled child - but they're forced to leave the scene before they can properly investigate.
Fearing their witness is in danger, they redouble their efforts to find him. As Robin deals with frustrations in her marriage and Strike accepts a dependency on a new girlfriend, their investigation deepens.
The duo are taken all over London in pursuit of the truth, from a derelict warehouse filled with protestors to a high-society charity fundraiser. But ultimately, our favourite detectives are unable to stop another tragedy...
Whilst Robin struggles with changes in her personal life, she and Strike are able to provide some comfort to a grieving father. The pair interview more key players in the case and work closely with the police - still honing in on the blackmailer's elusive accomplice.