Dawn follows the story of Dawn Longchamp (Bassinger), who after growing up in humble surroundings with a very hardworking family including her devoted father Ormand (Metcalfe) and older brother Jimmy (Clarke), suddenly has everything she loves ripped away from her. After discovering the shocking truth about the people who raised her, she is thrust into a new family whose dark and twisted secrets change the course of her life forever. As Dawn struggles to fit in, her wicked grandmother Lillian Cutler (Mills) rules her life with an iron fist and inflicts cruel punishments when Dawn does not follow her strict orders. When Dawn finds herself entrenched in the mysteries surrounding the family, it becomes clear that a dark and inescapable curse looms over the Cutlers.