Watch Castle Season 4 Episode 1 online via TV Fanatic with over 5 options to watch the Castle S4E1 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.
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On the fourth season premiere of Castle, Beckett's fate is found out and the detectives meet their new captain. Will Castle & Beckett reconnect? Find out in our review now.