When Jess was thirteen, her mother went for a walk and never returned. As soon as she was old enough, Jess fled the small town of Knife River. But one morning, fifteen years after her mother's disappearance, she gets the call she's been bracing for: Her mother's remains have been found. Jess returns to find Knife River - and her sister - frozen in time. Liz still lives in their childhood home and has become obsessed with missing persons cases. As Jess gets caught up in the case and falls back in with her high school girlfriend, her understanding of the past, of Liz, of their mother, and of herself become more complicated - and the list of theories more ominous.