The Reformatory
By Tananarive Due. This gripping ghost story was inspired by a real-life ancestor of the author's, who died in a reformatory in the Jim Crow South. "Haints" are the least of Robbie Stephens' problems when he's sent to a sadistic juvenile prison for a trumped-up offense against a white boy in the rural Florida of 1950. The town's white power brokers want to use him as a pawn to bring his father out of hiding; Klansmen and police alike are gunning for Robert Senior because of his work organizing millworkers and registering Black voters. Meanwhile, Robbie's teenage sister and her 80-year-old godmother are discovering that even NAACP lawyers aren't a match for the racist judicial system. Freeing Robbie will require supernatural intervention.
Source: https://www.simonandschuster.com/books/The-Reformatory/Tananarive-Due/9781982188344