A chilling secondary thread involves a man crafting a traditional Icelandic slaughtering mask (an infernal mask ) intended for humans.

Simultaneously, Sigurður Óli's marriage is ending, and his father is battling cancer, forcing the character to re-examine his own rigid, conservative worldview. Critical Reception

True to Nordic Noir, the book is described as a dark, atmospheric procedural that uses mundane personal lives to ground a complex conspiracy.

Critics praise the inclusion of the banking crisis, which adds a layer of timely social critique to the mystery. Availability & Series Context

The story begins with Sigurður Óli attempting to help a friend by confronting a couple of blackmailers. This "unauthorized" favor quickly spirals out of control when he finds the woman from the blackmailing duo brutally beaten in her home.

The plot is deeply intertwined with the rampant speculation and white-collar crime that preceded Iceland's economic crash.