C.B. Strike (seasons 3–4)

A troubled young man named Billy comes to private eye Cormoran Strike’s office to ask for his help investigating a crime he thinks he witnessed as a child. Strike and Robin set off on a twisting trail that leads them through the backstreets of London, into a secretive inner sanctum within Parliament and to a beautiful but sinister manor house deep in the countryside.

Private detective Cormoran Strike is visiting his family in Cornwall when he’s approached by a woman, Anna Phipps asking for help finding her mother, Margot Bamborough, who went missing under mysterious circumstances in 1974. Never tackling a cold case before, he’s intrigued and takes it on, adding to the long list of cases that he and his partner are currently working on. As Strike and Robin investigate Margot’s disappearance, they come up against a fiendishly complex case with a psychopathic serial killer and witnesses who cannot all be trusted.

When frantic, desperate Edie Ledwell appears in the office begging to speak to her, private detective Robin Ellacott doesn't know quite what to make of the situation. The co-creator of a popular cartoon, The Ink Black Heart, Edie is being persecuted by a mysterious online figure who goes by the pseudonym of Anomie. Edie is desperate to uncover Anomie's true identity.