Watch Castle Season 3 Episode 10 online via TV Fanatic with over 5 options to watch the Castle S3E10 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.
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A body is found floating in the East River on this episode, which leads Castle and Beckett into old tunnels and passageways of New York City. Once there, the partners find a secret from the days of Prohibition.