Cormoran Strike and Robin Ellacott are at odds following Robin’s wedding to Matthew, but there’s no time to mull over 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.

A startling discovery seems to confirm the story of the strangled child, but the team are forced to leave the scene before they can properly investigate. Fearing their witness is in danger, they redouble their efforts to find him.

Robin discovers a startling truth close to home. The government minister’s blackmailer becomes the prime suspect in the case, but Robin and Strike believe there was an accomplice.

Robin admits the truth to Strike, and a valuable clue helps them solve the case. Season finale.

Strike is approached by a woman asking for help to find her mother, Margot Bamborough, who went missing in 1974 when a psychopathic serial killer stalked the streets.

The investigation takes a dangerous turn as a disturbing piece of evidence leads Robin and Strike into London’s underworld. Robin risks her life by pursuing a vicious suspect.

Spurred on by the father of a young woman who also went missing in the 1970s, the detectives attempt to outwit an incarcerated serial killer who may hold the key to the case.

Strike realises that Margot’s killer is responsible for many other murders that have gone undetected, and lays a trap.

Edie Ledwell, the co-creator of a cult TV cartoon, The Ink Black Heart, is being harassed by an online figure, Anomie. She asks Robin to uncover Anomie's true identity.

Robin, Strike and Barclay all take risks to further the investigation now that they think Anomie probably killed Edie Ledwell. Strike receives an unexpected and unwelcome visitor.

Robin and Strike make a major breakthrough, having eliminated several suspects. Robin's cover is blown, and Strike stays the night at her new flat. Meanwhile, Anomie claims another two victims.

The agency is the target of a devastating attack. Strike figures out who killed Edie, and having secured proof, Robin puts herself in danger in order to save lives.