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Currently you are able to watch "Blue Bloods - Season 4" streaming on Paramount Plus, Paramount+ Amazon Channel, Paramount Plus Apple TV Channel or buy it as download on Apple TV.
There are no options to watch Blue Bloods for free online today in Canada. 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.
In Season 4 of Blue Bloods, tensions arise as Frank and Erin disagree over a case that involves the death of a cop. Later, Danny is forced into the role of lead hostage negotiator as Erin's life hangs in the balance. Meanwhile, Jamie's conduct is called into question--more than once.