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Blue Bloods Season 8 Episode 21 "The Devil You Know" Promo


Blue Bloods Season 8 Episode 21 "The Devil You Know" Promo

Here is a short promo for Blue Bloods Season 8 Episode 21 "The Devil You Know", airing this Friday on CBS!

Inside the episode: Frank goes head-to-head with a data-tracking company when they refuse to unlock the phone of a terrorist that may hold information regarding upcoming targets.

Head over to Blue Bloods Episode Guide: "The Devil You Know" for the full description of this episode.