In the land of Vikings, a young prince named Amleth witnesses a brutal betrayal: his uncle murders his father, the king, and seizes the throne. Following this vile treachery, Amleth's mother is forcibly taken as the usurper's wife. Overcome with despair and rage, Amleth narrowly escapes the same fate that befell his father by fleeing his homeland. Haunted by his father's death and his mother's capture, he vows a sacred oath of vengeance against his uncle and promises to save his mother. The trauma of his family's usurpation shapes his destiny, and the quest for retribution consumes his being. He grows up with one purpose in life: to return to his kingdom and exact his revenge.

Years later, hardened by relentless training and Viking raids, Amleth has become a formidable warrior. Now a grown man, he embarks on the mission he has been preparing for all his adult life. His journey takes him to a land ruled by an enigmatic sorceress where he uncovers an unexpected opportunity to infiltrate the inner circle of his treacherous uncle. To fulfill his vow, Amleth poses as a slave during a raiding party and is taken to the very heart of his enemy's stronghold. Within these walls, he must navigate a dangerous web of power, violence, and betrayals if he is to achieve his revenge and liberate his mother.