Haunting Adeline follows Adeline Reilly, a young author who has recently moved into her family’s home in Washington state following the death of her grandmother. She is stalked by Zade Meadows, the leader of an underground organization, Z, which aims to end human trafficking. With the help of her friend Daya, Adeline uncovers the secrets of her new home, Parsons Manor, and the murder of her great-grandmother, Gigi, all while trying to keep Zade at an arm’s length.