Prince Amleth is on the verge of becoming a man when his father is brutally murdered by his uncle, who kidnaps the boy's mother. Two decades later, Amleth is now a Viking who's on a mission to save his mother, kill his uncle and avenge his father.

Electrician Atli, his wife María, an astronomer, and their daughter, musician Anna, live in Iceland. María plans a trip with her family into the highlands to photograph a comet she thinks she's discovered. When the day comes, Atli and Anna have made other plans and cannot go with her. That twist of fate upends all their lives and leads them into a different orbit.