The first season, subtitled ', presents the murder trial of O. J. Simpson, based on Jeffrey Toobin's book "The Run of His Life: The People v. O. J. Simpson". The second season, subtitled ', explores the murder of designer Gianni Versace by serial killer Andrew Cunanan, based on Maureen Orth's book "Vulgar Favors: Andrew Cunanan, Gianni Versace, and the Largest Failed Manhunt in U. S. History".