Complete story — includes the ending
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". Competing for membership is another investigator, Kendall Frost ( Summer Glau ). As their investigation progresses, Castle learns a dark secret from Hayley that she knew Castle through his father during his missing two months. Castle eventually discovers that he himself had his memories erased and uncovers a video in which Castle reveals that he had known about LokSat and had nearly gotten himself killed trying to catch him. Knowing that Beckett would never give up if she knew the truth, Castle had all of his knowledge erased from his mind in order to protect her. As a result, Castle realizes that he inadvertently caused the death of Beckett's former AG team by trying to protect her.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Castle season 8. HTML formatting and reference markers removed. · Content license