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Currently you are able to watch "Castle - Season 4" streaming on Amazon Prime Video, Hulu, Amazon Prime Video with Ads or for free with ads on The Roku Channel. It is also possible to buy "Castle - Season 4" as download on Amazon Video, Apple TV, Fandango At Home, Microsoft Store.
Prepare for a season full of suspense as Castle works to identify Beckett's shooter while Beckett struggles with the aftermath of her near-death encounter. All the while, the duo tackles a new batch of New Your City's most interesting cases.