From friendly, gentle golden retriever to vicious guardian, Gabby has undergone an inexplicable transformation during the days she was missing from her family home. At first, the pet parents dismiss the dog’s differences in behavior as resulting from whatever she experienced while she was away. Once her owners realize Gabby no longer needs food or water, there’s no denying something isn’t right. When they begin seeing supernatural beings, they sense that the dog is just one part of a bigger plan.