Someone won't stop knocking at Grace Adams' door. Grace thinks she knows who it is, but when she looks down from her window she sees a woman she doesn't recognize. Then a man emerges from the dark woods, stabs her, and leaves her for dead. Grace goes to help the woman and is shocked to find it's her mother, Leanne, who abandoned her 11 years ago. There's nothing Grace can do. But Detective Macy Greeley has been waiting for Leanne since she disappeared from Collier, Montana, to close a case that's haunted the town for far too long.