In its penultimate episode on September 13, The Sinner crossed the line again with a scene in which teen sisters Cora (Jessica Biel) and Phoebe (Nadia Alexander) kiss each other and Frankie (Eric Todd). Frankie and Phoebe then have sex on the couch while Jessica Biel gets intimate with her boyfriend J.D. (Jacob Pitts) and another man on the floor in the same room. From the series that brought us an incestuous scene between the sisters last week, Part VII met my newly-lowered expectations.