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.

Writing:
  • Robin Green
  • Mitchell Burgess

Stars:
Release Date: 2010-09-24
Seasons: 1 2 3 4 5 6 7 8 9 10 11 12 13 14
TMDb: 7.8/10
  • Country: US, GB
  • Language: English
  • Runtime: 45

Other episodes for this season

Cutting Losses
Episode 1 - Cutting Losses
Ghosts of the Past
Episode 2 - Ghosts of the Past
The Enemy of My Enemy
Episode 3 - The Enemy of My Enemy
Out of the Blue
Episode 4 - Out of the Blue
The Forgotten
Episode 5 - The Forgotten
Brushed Off
Episode 6 - Brushed Off
Common Ground
Episode 7 - Common Ground
Pick Your Poison
Episode 8 - Pick Your Poison
Pain Killers
Episode 9 - Pain Killers
Heavy Is the Head
Episode 10 - Heavy Is the Head
Second Chances
Episode 11 - Second Chances
The Brave
Episode 12 - The Brave
Erasing History
Episode 13 - Erasing History
School of Hard Knocks
Episode 14 - School of Hard Knocks
Legacy
Episode 15 - Legacy
Tale of Two Cities
Episode 16 - Tale of Two Cities
Close Calls
Episode 17 - Close Calls
Friendship, Love, and Loyalty
Episode 18 - Friendship, Love, and Loy...
Risk Management
Episode 19 - Risk Management
Your Six
Episode 20 - Your Six
The Devil You Know
Episode 21 - The Devil You Know
My Aim is True
Episode 22 - My Aim is True