Midsummer celebrations end when a man is found strung up alongside slaughtered animals and another victim turns up in his car in a meadow. Is a copycat killer at work?

A lawyer driving through the Gotland countryside disappears without a trace. A mink farmer receives a death threat and a sadistic trap is set up on his premises. Maria becomes personally involved in the investigation and finds herself in more danger than she thought possible.

It's Christmastime when Gotland is struck by unspeakable tragedy - a high-school girl is found dead in the middle of a country road wearing a white Lucia gown. What appears to be suicide becomes more sinister when Maria and her colleagues find e-mails indicating that the high school is a hotbed of conflict, rivalry and extortion.

Two women, seemingly unconnected, die in apparent suicides. With no evidence for murder, Maria Wern and her colleagues at the Gotland police department find themselves looking for a stalker or considering psychosis in the victims. When more dead bodies show up, Maria's colleagues Ek and Erika are forced further into the center of events than they ever thought they would be.

The charred body of a medium is found in the gutted remains of her office after a fire. When another two murders take place in the same manner, it becomes clear to the Gotland police that they have a serial killer on their hands - but without having the slightest idea what the victims had in common, or who the next one might be. Maria Wern is forced to lead an investigation where neither the motive nor the victims seem to be connected — at the same time that her colleague Arvidsson’s loyalty is forcibly put to the test.

A ten-year-old boy disappears from a dinner in a little fishing village, while another vanishes from a refugee camp on the island. These are but the first in series of frightening events to take place on the island of Gotland, where a string of brutal murders are committed in quick succession.