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Blue Bloods · S8 E21

The Devil You Know

2018-05-04 · 45 min

Frank locks horns with a data-tracking company when they refuse to unlock a terrorist's phone that may hold information regarding upcoming targets. Erin obtains information about an impending murder from a shady source.

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Season 8 Episodes

  • E1Cutting Losses
  • E2Ghosts of the Past
  • E3The Enemy of My Enemy
  • E4Out of the Blue
  • E5The Forgotten
  • E6Brushed Off
  • E7Common Ground
  • E8Pick Your Poison
  • E9Pain Killers
  • E10Heavy Is the Head
  • E11Second Chances
  • E12The Brave
  • E13Erasing History
  • E14School of Hard Knocks
  • E15Legacy
  • E16Tale of Two Cities
  • E17Close Calls
  • E18Friendship, Love, and Loyalty
  • E19Risk Management
  • E20Your Six
  • E21The Devil You Know
  • E22My Aim is True