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Currently you are able to watch "Castle - Season 1" 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.
A murder-mystery writer and a detective team up to catch a serial killer who is reenacting murders from his books. Once the case is solved, the unlikely pair continue to work together to probe New York City's most unusual homicides.