He killed your best friend years ago. Now he's back. From the outside looking in, Winona has it all. A great job, a near-perfect fiance, a home she loves. But in the winter of 2022, one event threatens to topple this delicate house of cards. Years ago, her best friend Rosie was murdered in cold blood. Strangled, assaulted, and dumped in the river that runs through the city. Not only that, but she was the last in a series of violent crimes believed to be the work of a serial killer. Winona has done everything right to move on with her life even though Rosie's murder haunts her. She was with her that night and they got into a fight. Rosie left the bar they were at and Winona never saw her alive again. After Rosie's death, the murders stopped. Now, toying with the idea of trying for a baby, Winona sits across from her soon-to-be husband Mason in a diner on a Saturday morning. By chance, she catches the tail end of a news broadcast. A murder in Oklahoma City. And the details sound all too familiar. A missing girl, Rosie's age, found assaulted and strangled on the riverbank. Winona's therapist tells her it's a coincidence. Mason tells her these things happen. It doesn't have to be connected to Rosie. As the holidays approach, and another girl is found in the same manner, the cops have absolutely no leads. An old friend shows up who also knew Rosie and Winona decides she needs to take matters into her own hands. But those closest to her don't understand that she can't simply let this go. She needs to find the guy. For Rosie