The Memory Watcher by Minka Kent

The novel follows Autumn Carpenter, a woman who becomes obsessed with the seemingly perfect McMullen family after losing custody of her own daughter. Through social media, Autumn meticulously tracks their lives, particularly focusing on their adopted daughter, Grace. As she delves deeper into their world, Autumn's fixation grows, leading her to uncover dark secrets and hidden truths about the family. The story explores themes of obsession, identity, and the deceptive nature of appearances, culminating in a suspenseful and unexpected twist that challenges perceptions of reality and morality.