SERIES FINALE: This gripping, unsettling series ends tonight, providing the final chapter to this fact-based story of a young woman who enticed her boyfriend to kill her mother. Last week, the body had been discovered, and the young couple were being interviewed separately by investigators. Their stories were as different as they were unusual, and the same could be said of their unusual perspectives and actions. Like mailing the murder weapon to themselves, for example. Patricia Arquette stars as the mother, who is almost as much torturer as victim, and Joey King (pictured) plays the devious daughter. What a family. What a story. What a TV series.