Having long wondered what lives beyond the ice shelf, nineteen-year-old mermaid Ersel learns of the life she wants when she rescues and befriends Ragna, a shield-maiden stranded on the merfolks fortress. But when Ersels childhood friend and suitor catches them together, he gives Ersel a choice: Say goodbye to Ragna or face justice at the hands of the glaciers brutal king. Determined to forge a different fate, Ersel seeks help from the divine Loki....