Blue Bloods Season 8 Episode 21 The Devil You Know 2017
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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.
- Released: 2018-05-04
- Runtime: 45 minutes
- Genre: Drama, Crime
- Stars: Tom Selleck, Donnie Wahlberg, Bridget Moynahan, Will Estes, Len Cariou
- Director: Mitchell Burgess, Robin Verde, Charles McClelland, Robin Green
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1. Cutting Losses 2017-09-29
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2. Ghosts of the Past 2017-10-06
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3. The Enemy of My Enemy 2017-10-13
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4. Out of the Blue 2017-10-20
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5. The Forgotten 2017-10-27
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6. Brushed Off 2017-11-03
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7. Common Ground 2017-11-10
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8. Pick Your Poison 2017-11-17
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9. Pain Killers 2017-12-01
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10. Heavy Is the Head 2017-12-08
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11. Second Chances 2018-01-05
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12. The Brave 2018-01-12
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13. Erasing History 2018-01-19
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14. School of Hard Knocks 2018-02-02
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15. Legacy 2018-03-02
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16. Tale of Two Cities 2018-03-09
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17. Close Calls 2018-03-30
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18. Friendship, Love, and Loyalty 2018-04-06
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19. Risk Management 2018-04-13
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20. Your Six 2018-04-27
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21. The Devil You Know 2018-05-04
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22. My Aim is True 2018-05-11
