The episode's title, "The Ink Black Heart," references both the tattoo parlor where the murder took place and the darker aspects of human nature that Strike and Ellacott encounter during their investigation. The case involves themes of obsession, fandom, and the darker side of the internet.

That’s an episode of C.B. Strike (based on Robert Galbraith/J.K. Rowling’s novels), specifically “The Ink Black Heart” — Season 1 of that adaptation (though in some listings it’s season 5 or 6 of Strike , depending on how they number the series).

This blog post provides an overview of the television adaptation of The Ink Black Heart

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: The season is described as having a "glacial" pace at times, building a slow-burn mystery that feels "muddled" to some but rewarding for fans of the source material.