It’s 1951. The Thebes State Penal Farm in Mississippi is up a dark river, surrounded by swamps and impenetrable piney woods. It’s the Old South at its most brutal — a place of violence, racial terror, and even more horrific rumors. Of the few who make the journey, black or white, even fewer return. But in that year, two men will come to Thebes. The first is Sam Vincent, the former prosecuting attorney of Polk County, Arkansas who, with great misgivings, accepts a job to investigate a disappearance. Before he leaves on this dangerous trip, he confesses his fears to his former investigator Earl Swagger, now a sergeant of the Arkansas State Police. Earl pledges that if Sam is not back by a certain time, he will come looking for him.