Blue Bloods Season 8 Episode 21
The Devil You Know
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.
8 - 22My Aim is TrueMay. 11, 2018- 8 - 21The Devil You KnowMay. 04, 2018
- 8 - 20Your SixApr. 27, 2018
- 8 - 19Risk ManagementApr. 13, 2018
- 8 - 18Friendship, Love, and LoyaltyApr. 06, 2018
- 8 - 17Close CallsMar. 30, 2018
- 8 - 16Tale of Two CitiesMar. 09, 2018
- 8 - 15LegacyMar. 02, 2018
- 8 - 14School of Hard KnocksFeb. 02, 2018
- 8 - 13Erasing HistoryJan. 19, 2018
- 8 - 12The BraveJan. 12, 2018
- 8 - 11Second ChancesJan. 05, 2018
- 8 - 10Heavy Is the HeadDec. 08, 2017
- 8 - 9Pain KillersDec. 01, 2017
- 8 - 8Pick Your PoisonNov. 17, 2017
- 8 - 7Common GroundNov. 10, 2017
- 8 - 6Brushed OffNov. 03, 2017
- 8 - 5The ForgottenOct. 27, 2017
- 8 - 4Out of the BlueOct. 20, 2017
- 8 - 3The Enemy of My EnemyOct. 13, 2017
- 8 - 2Ghosts of the PastOct. 06, 2017
- 8 - 1Cutting LossesSep. 29, 2017
