Pale Horse Coming(Earl Swagger 2) by Stephen Hunter

The Year is 1951. A smooth-talking Chicago lawyer has come to chat with Sam Vincent, a former prosecutor, about a dangerous unknown - a prison for violent black convicts in Thebes, Mississippi, a place of many questions but no answers. Would Sam, a white man and a Southerner, be willing to investigate?When Sam vanishes in the mists and swamps, his old friend Earl Swagger