Socially awkward Chloe Cooper divides her time between dog walking, bartending, caring for her ailing mother, and at a safe distance, watching people and inventing the stories of their lives. Like Chloe's new neighbors: glamorous influencer Jemma Spengler and Jemma's husband, Adam, a renowned surgeon. They're attractive, wealthy, and in a house of open windows, so exposed.

A move to the Pacific Northwest is supposed to be a fresh start for Jemma and Adam. It's a renewed commitment to a marriage fractured by secrets. A chance to work through the tragic losses in their past. For Jemma, however, this new beginning also comes with an unnerving sensation that she's being watched.

Then, on a fog-shrouded beach early in the morning, Chloe witnesses the murder of a swimmer. Her suspicions aroused, she suddenly sees her neighbors in a sinister new light. But as a detective and her partner close in, nothing is quite as it seems. Because the Spenglers are not the only ones with secrets. And Chloe isn't the only one who's been watching.