A New York sales manager is sent to the remote Scottish Highlands at Christmas to acquire a limited edition perfume from a dashing Earl preparing for his annual ball and falls in love instead.

A zombie apocalypse threatens the sleepy town of Little Haven – at Christmas – forcing Anna and her friends to fight, slash and sing their way to survival, facing the undead in a desperate race to reach their loved ones. But they soon discover that no one is safe in this new world, and with civilization falling apart around them, the only people they can truly rely on are each other.