Kelly Medina's son left for college a year ago and now she feels totally alone. So when she discovers that a single mother also called Kelly Medina has moved to her town, it's an unexpected reminder of the life she used to live.For days, Kelly can't stop thinking about the woman who shares her name, who has a baby son she can still hold and her whole life ahead of her. She can't help looking for her: at the grocery store, at the gym, on social media. When they happen to bump into each other outside a pediatrician's office, simple curiosity gets the better of them both.Their unlikely friendship brings Kelly a renewed sense of purpose. But the relationship quickly turns to obsession, and when one Kelly disappears the other one may know why . . .