Wordless (save for the song "Walking in the Air") animated adventure about a young English boy who makes a snowman one Christmas Eve, only for it to come to life that night and take him on a magical adventure to the North Pole to meet Santa Claus.

After his mother's death, Isaac and his pregnant wife return to his birthplace on a remote Norwegian island to claim on unexpected inheritance. During their visit, the couple discover dark secrets from Isaac's past. Their pleasant trip quickly turns into a nightmare when Isaac and his wife encounter a sinister cult that worships a sea-dwelling deity.