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. Some years later, detective Lars Haaland is teamed up with Alfhildr Enginnsdottir, the first police officer with Viking origin, to solve a mysterious murder.