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Currently you are able to watch "Castle - Season 3" 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 3" as download on Apple TV, Fandango At Home, Microsoft Store.
She’s still armed. He’s still dangerous. And their chemistry is hotter than ever. Season three finds both Richard Castle and Detective Kate Beckett pursuing romantic options of their own. Their signals may be crossed, but this duo hasn’t lost any of their spark. With Beckett’s intrepid police work and Castle’s uncanny insight, solving murder has never been so much fun.