Blue Bloods Season 8 Episode 21
Frank locks horns with a data-tracking company when it refuses to unlock a terrorist’s phone that may hold information regarding upcoming targets; Erin obtains information about an impending murder from a shady source; a woman kidnaps a baby.
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TV-Show Info Page: Blue Bloods TV-Show Info
Episode Title: The Devil You Know
Air Date: 2018-05-04
Season 8 Episodes List:
Episode 1 - Cutting LossesEpisode 2 - Ghosts of the PastEpisode 3 - The Enemy of My EnemyEpisode 4 - Out of the BlueEpisode 5 - The ForgottenEpisode 6 - Brushed OffEpisode 7 - Common GroundEpisode 8 - Pick Your PoisonEpisode 9 - Pain KillersEpisode 10 - Heavy Is the HeadEpisode 11 - Second ChancesEpisode 12 - The BraveEpisode 13 - Erasing HistoryEpisode 14 - School of Hard KnocksEpisode 15 - LegacyEpisode 16 - Tale of Two CitiesEpisode 17 - Close CallsEpisode 18 - Friendship, Love, and LoyaltyEpisode 19 - Risk ManagementEpisode 20 - Your SixEpisode 21 - The Devil You KnowEpisode 22 - My Aim is True