Hoping to reconnect over Christmas, a family of four travel to a remote island in the Danish archipelago, only to find it controlled by members of a strongly religious community living in balance with fierce creatures in the woods revealed to be... elves. Real, monstrous beings that inspired the folklore and myths we all know. When the girl in the family finds and brings home a baby elf, she inadvertently disrupts the balance and throws everyone on the island into a life-or-death battle for faith, family and pure survival.