When detective-in-training Sigurdís interrupts her studies in the US to return to Iceland, after discovering that the investigation into her abusive father’s death has been dropped, she’s plunged into a completely new case: controversial TV personality Olga Einars has been stabbed to death during the Reykjavík Marathon by an attacker who’ll go to any lengths to cover up their crime. Detective-in-training Sigurdís has travelled to the US to study criminal psychology, but her plans are thrown into disarray when she discovers that her boss and mentor, Garðar, has been stood down from Reykjavík CID over his investigation into Sigurdís’s abusive father’s untimely death.

Returning to Iceland to deal with the fallout, Sigurdís finds herself pulled into a disturbing case: controversial TV personality Olga Einars has been stabbed to death during the Reykjavík Marathon, with the police trying to locate a runner wearing the number 1407, who was seen near her during the race. But when they discover that several masked runners were wearing the same number, the mystery only deepens. As Sigurdís digs deeper, alongside fellow detective Unnar, her on-off boyfriend, she soon learns exactly how unpopular Olga was – not just with the interviewees she humiliated on live TV, but with her own son, her business partner, a widower who insists that she had a hand in his wife’s death, and her ex-husband, who died in suspicious circumstances thirty years ago… As her exploration into Olga’s past becomes ever darker and more harrowing, Sigurdís must also face the truth about her father, and the roles her mother and Garðar played in his violent death…