A gripping detective novel by Robert Galbraith and the sixth book in the Cormoran Strike series.

Private investigator Cormoran Strike is approached by Edie Ledwell, co-creator of the wildly popular online animated series The Ink Black Heart. Edie has become the target of a relentless online harassment campaign led by an anonymous figure using the pseudonym Anomie. Fearing for her safety, she asks Strike to uncover the troll's identity.

Before Strike can take the case, Edie is brutally murdered in a London cemetery, and the police launch a homicide investigation. Strike and his investigative partner Robin Ellacott decide to pursue the case independently, diving deep into the toxic world of online fandoms, anonymous chatrooms, social media, and digital identities.

As they unravel a web of false identities, personal grudges, hidden relationships, and long-buried secrets, Strike and Robin find themselves facing a highly intelligent killer who uses the internet to manipulate, intimidate, and deceive. The investigation becomes increasingly dangerous as they struggle to separate truth from misinformation while navigating one of the most complex cases of their careers.

Combining a classic whodunit with a modern exploration of internet culture, cyberbullying, online radicalization, and digital anonymity, The Ink Black Heart is one of the most intricate and ambitious novels in the series.