Shortly after moving from California to Salem, Massachusetts, Max Dennison finds himself in hot water when he accidentally releases a coven of witches, the Sanderson sisters, from the afterlife. Max, his sister, and his new friends (human and otherwise) must find a way to stop the witches from carrying out their evil plan and remaining on earth to torment Salem for all eternity.

Twenty-five years later, Max and Allison's seventeen-year-old daughter, Poppy, finds herself face-to-face with the Sanderson sisters in all their sinister glory. When Halloween celebrations don't quite go as planned, it's a race against time as Poppy and her friends fight to save her family and all of Salem from the witches' latest vile scheme.