Minnesota, 1970s. A snowmelt has sent floodwaters down to the fields of the Red River Valley, dragging the body of an unidentified Native woman into the town of Ada. The only evidence the medical examiner recovers is a torn piece of paper inside her bra: a hymnal written in English and Ojibwe. Cash Blackbear, a 19-year-old Ojibwe woman, sometimes helps Sheriff Wheaton, her guardian, on his investigations. Now she knows her search for justice for this anonymous victim will take her to the White Earth Reservation, a place she once called home. When Cash happens upon two small graves in the yard of a rural, "speak-in-tongues kinda church," Cash is pulled into the lives of the malevolent pastor and his troubled wife while yet another Native woman dies in a mysterious manner.