时长:00:41:09 / 首播:2016-03-07
Castle, Alexis and Hayley go to Los Angeles in search of answers for his missing two months. At the same time, he is extended an invitation from a prestigious detectives' club in exchange for solving the murder of one of their members, who was tracking an elusive bi-coastal serial killer called "The Phantom". As their investigation progresses, Castle learns a dark secret from Hayley.