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Currently you are able to watch "Castle - Season 4" streaming on Disney Plus or buy it as download on Apple TV, Microsoft Store.
There are no options to watch Castle for free online today in Australia. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
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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.