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Currently you are able to watch "Castle - Season 5" streaming on Disney Plus or buy it as download on Microsoft Store, Apple TV.
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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Now that Castle and Beckett have finally given in to their true feelings for each other, how will it affect their work together? As they try to keep their new relationship under wraps from their co-workers, the unlikely duo must track down the murderer of Beckett's mother, find the perpetrator of a major conspiracy and untangle a line of investigation that links Castle to a ritualistic killing.