I Want Your Family: An incredibly addictive and page-turning psychological thriller (The Hunt family)

A delivery driver becomes obsessed with the Hunt family after regularly visiting their home. She observes Sadie Hunt, the wife and mother, and believes Sadie's marriage is troubled, noting cold stares between Sadie and her husband Reid. The driver becomes convinced that Sadie doesn't deserve her life—her house, her two children, or Reid, who she views as providing everything for the family. As the driver makes her deliveries, she interprets Reid's polite interactions with her as signs of mutual attraction. She becomes determined to replace Sadie as Mrs. Hunt, believing Sadie deserves what is coming to her. The driver resolves to do whatever it takes to make the family her own.