Being the greatest zombie fighter of all time is a lot for one animal, but Emmy's the perfect hamster for the job, and she fiercely defends her animal friends. That is, until the mammals she lives with invite a weasel, of all creatures, to join their camp. This unthinkable betrayal reminds Emmy that she is a lone warrior at her core. But when she tries to go solo, she discovers that being alone might not be such a good thing after all. Maybe the love of her friends is what gave her the courage to fight zombies in the first place.