In 895, King Aurvandill returned to the fictional island of Hrafnsey after his overseas conquest, reuniting with his wife, Princess Gudrún, and his heir, Prince Amleth. To prepare Amleth for his final ascension, father and son attend a ceremony hosted by Aurvandill comedian Heimir. Heimir tells Amleth that his fate is fixed and cannot be escaped, and Amleth vows to avenge his father if Aurvandill is killed rather than live in shame. The next morning, Amleth's uncle Fjölnir staged a coup in the palace, beheading Aurvandill directly and expelling Gudrún. Amleth escapes from Fjölnir's assassins and runs through the boat with a vengeance. Years later, adult Amleth was ulfheðnar with a group of Vikings. After raiding a village in Gardariki Amleth met Seress in the temple of Svetovit; Seeress says it was Odin's intention for Amleth to avenge Fjölnir and instruct Amleth to "follow the tail of vixen" and that his fate was related to the Maiden-King. Amleth soon learned that "Fjölnir the Brotherless" had lost his throne to King Harald Fairhair of Norway and now lived as a sheep farmer in Iceland. Haircut and slave Amleth sneaks into the ship. He meets a Slavic female slave named Olga, who claims to be a witch. They were brought to Fjölnir's farm, where Amleth learned that his mother had married Fjölnir and had given birth to a son, Gunnar. One night, Amleth follows a monkey and meets a witch who facilitates a spiritual conversation between Amleth and Heimir's skull, which Fjölnir also killed. The witch also tells Amleth about Draugr, the magic sword in Gates of Hel. Amleth enters a hill and gets a sword after fighting the undead. He hid his sword when he returned to the field. The next day Amleth was selected to compete in a knattleikr game against another farm. The game turns violent and Gunnar is almost killed, but Amleth saves him. As a reward, Fjölnir's adult son Thorir gives him the task of overseeing and allowing him to recruit women. During the evening celebrations, Amleth and Olga make love; They promised to conquer Fjölnir together. Amleth killed several Fjölnir men, and Olga mixed their food with fly agaric, a powerful hallucinogen. Subsequent unrest and suspicion that the Christian slaves were behind the massacre allowed Amleth to enter Fjölnir's home. Amleth reveals his identity to Gudrún, who responds that she was Aurvandil's slave and that Amleth had been raped. Gudrún also reveals that she was the mastermind of Fjölnir's coup because she wanted Aurvandill and Amleth dead. She then tries to seduce Amlet, who after a while rejects her. In a fit of rage, Amleth kills Thorir and then cuts off and steals his heart. Gudrún reveals Amleth's true identity to Fjölnir and calls for the death of her eldest son. Fjölnir decides to kill Olga, but Amleth offers to trade Olga's life for Thorir's heart. After a severe beating, Amleth is freed from his ban by a herd of crows sent by Odin. Olga also rescues Amleth, who tells her that his mother has killed his past. Amleth decides to give up his quest for revenge, and the two decide to flee by boat to his relatives. In Orkney Islands. But then Amleth had a vision and found out that Olga was pregnant with twins, one of whom would become the Maiden-King prophesied by the Seeress. Knowing that Olga and their children would not be safe while Fjölnir lived in Amleth, despite Olga's pleas, he jumped out of the boat and swam ashore. Returning to the farm, Amleth frees the slaves and kills the Fjölnir warriors. While searching, Fjölnir Amleth was attacked by Gudrún and pushed Draugr to her heart. Gunnar jumps on Amleth's back, stabbing his half-brother over and over again until Amleth kills him too. Fjölnir, having found his wife and son dead cold, tells Amleth to meet him at the Gates of Hel. At the crater Hekla Amleth and Fjölnir join the fierce Holmgang until Fjölnir is beheaded and Amleth is stabbed to death at the same time. As he was dying, Amleth had a vision of Olga hugging their two children, whom she told him were safe before pushing him away. Valkiri carries Amleth through the gates of Valhöll (Valhalla).