A new phenomenon starts happening all over the world. Powerful flashes of light occur in the ocean, and people from the past appear from three time periods; the stone age, the Viking age, and the late 1800s. No one understands how this is possible, and the people from the past, called beforeigners, have no memory of what's transpired. A couple of years later, Alfhildr - who comes from the Viking Age - is teamed up with burned-out police officer Lars Haaland as part of the police department's integration program. While investigating the murder of a woman with Stone Age tattoos, Lars and Alfhildr make unexpected discoveries.