The season focuses on a "buddy cop" duo tasked with solving the murder of a woman with Stone Age tattoos:

(Krista Kosonen): A former Viking shield-maiden and the police department's first "multi-temporal" recruit. Key Themes

(Nicolai Cleve Broch): A burned-out, cynical senior detective dealing with a drug habit and a complicated family life—his ex-wife has remarried a man from the 19th century.

Set in a nonspecific near-future Oslo, the story follows a global phenomenon where flashes of light in the water bring people from the past into the present. Several years after the first "Beforeigners" arrive, society has begrudgingly integrated them, though many live in poverty or maintain their old-world habits.