The Valhalla Murders is an Icelandic crime thriller series that follows the story of a detective named Arnar, who returns to Iceland after working for the FBI in the United States. He is assigned to investigate a series of brutal murders that seem to be connected to a dark secret from his past. As Arnar delves deeper into the case, he uncovers a web of corruption and betrayal that reaches high into the ranks of Icelandic society. The Valhalla Murders is a tense and suspenseful series that explores the dark underbelly of Iceland's capital city, Reykjavik.