A grisly murder investigation leads Castle and Beckett to a suspect who claims he's traveled back in time to stop terrible events from unfolding, events that will change the course of human history. Is he simply a deluded killer, or is it possible that he's telling the truth?
Keywords: criminal-consultant , criminal-investigation , female-detective , homicide-detective , new-york-city , novelist , police , police-procedural , writer , watch-series-online