Two days before Christmas, a young woman is found dead beneath the cliffs of the deserted village of Kalfshamarvik. Did she jump, or did something more sinister take place beneath the lighthouse and the abandoned old house on the remote rocky outcrop? With winter closing in and the snow falling relentlessly, Ari Thor Arason discovers that the victim's mother and young sister also lost their lives in this same spot, 25 years earlier....

Easter weekend is approaching, and snow is gently falling in Siglufjörður, the northernmost town in Iceland. Ari Thór Arason is now a police inspector, but he’s separated from his girlfriend, who lives in Sweden with their three-year-old son. A family reunion is planned for the holiday, but a violent blizzard is threatening and there is an unsettling chill in the air. Three days before Easter, a 19-year-old local girl falls to her death from the balcony of a house on the main street. A perplexing entry in her diary suggests that this may not be an accident. 

It's 1955. Two young couples move to the uninhabited, isolated fjord of Hedinsfjordur. Their stay ends abruptly when one of the women meets her death in mysterious circumstances. The case is never solved. Fifty years later an old photograph comes to light, and it becomes clear that the couple may not have been alone on the fjord after all....

On a jagged, bleak lava field just outside Reykjavik stands the Gallows Rock. Once a place of execution, it is now a tourist attraction. Until this morning, when a man was found hanging from it. The nail embedded in his chest proves it wasn't suicide. But when the police go to his flat, a further puzzle awaits: a four-year-old boy has been left there. He doesn't seem to have any link with the victim, his parents cannot be found and his drawings show he witnessed something terrible.

Detective Inspector Hulda Hermannsdóttir is sent to the isolated island of Elliðaey to investigate and soon finds haunting similarities with a previous case - a young woman found murdered 10 years ago in the equally desolate Westfjords. Is there a patient killer stalking these barren outposts? As Hulda navigates a sinister game constructed of smoke and mirrors she is convinced that no one is telling the truth, including those closest to her.