This is a "thriller" featuring the dumbest people in Iceland. Hulda, a police detective and the series protagonist, keeps seeing her husband Jon come out of their 13-year-old daughter Dimma's bedroom and develops the nagging feeling something is wrong, but she just can't figure out what. Dimma has become sullen, unresponsive, and completely detached from family life. Over and over Hulda wonders what could be wrong. Whenever she mentions it to Jon, he tells her to just relax and stop worrying, Dimma's just going through a phase. "Let me handle this, my love," says Jon repeatedly. Dimma has no scenes or dialogue. She's just in her room for the whole novel. We've got to schedule an appointment with a psychologist, insists Hulda. No, insists Jon. After Christmas. We'll do it after Christmas. Dimma kills herself on Christmas Day. But Hulda never confronts Jon about the molestation. She goes on living with him. She's still living with him as the novel ends. But she sure is mad at him!
The other dumbest people are Erla and Einar, isolated farmers. (We know at the beginning at the novel that Hulda is going to be investigating several bodies found at an isolated farm.) A stranger stops by one snowy day and Einar welcomes him in, even though Erla has reservations. Oops! They can't get the stranger to leave the house. Though the stranger is sleeping downstairs, Erla hears him walking around in the attic at night. But Einar still wants him there: for Einar, everyone is a wonderful person until that moment when they attack you.
Of course, the stranger cut the phone line before he came in.
The next day, Erla and Einar lure the stranger up to the attic and lock him in. As he bangs on the door, they go through his backpack and find a knife. At this point Erla starts to feel guilty. Maybe she's misjudged the stranger. Maybe he really is a nice, innocent person. They decide that Einar should go open the attic door and ask the stranger why he has this knife. Then they'll know whether he's a good person or a homicidal maniac.
Well, only one person is alive after Einar opens the door. And it isn't Einar!
But Erla doesn't know Einar is dead, because she has run outside in the snowstorm with no coat on for some reason. She suddenly sees her car and gets inside it to warm up. But she forgets to lock all the doors, and the stranger gets in too. Now Erla runs back into the house and locks all the doors. There's the stranger, banging on the doors to get in! Erla sneaks out the back and runs down to the cellar door and locks herself in. He'll never find her here. Oops! The electricity is out, and she forgot to bring matches and candles. How long will she have to sit down there in the dark?
Not long! Soon, the stranger is knocking on the cellar door. And Erla lets him in!
The stranger's invasion of Erla and Einar's home lasted so long that it was a relief when he finally killed them. I wished he had done it 100 pages sooner. But that didn't mean we were done with Erla: her thoughts came back, only now in italics.