Watch Castle Season 3 Episode 4 online via TV Fanatic with over 5 options to watch the Castle S3E4 full episode. Affiliates with free and paid streaming include Amazon, iTunes, Vudu, YouTube Purchase, and Google Play.
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Castle and Beckett look into the murder of a young mathematician this week. He was murdered with a 200-year-old bullet, which leads to thoughts of a time-traveling culprit.