Sigurd Svendsen (Pal Sverre Hagen) is a Norwegian archaeologist who is fascinated by a viking ship found at the Oseberg burial mound. He believes that a runic inscription on the ship, which translates to "man knows little," holds the key to understanding the Norse myth of Ragnarok: the day when heaven and earth are destroyed. After finding similar inscriptions on a stone in Northern Norway, Sigurd, along with his kids and a colleague, begins an expedition to uncover the secret of the day of doom.