S08E21: The Devil You Know
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.
Previous Episode 
Season 1
Pilot
S1E1 / 24 Sep 2010
Samaritan
S1E2 / 01 Oct 2010
Privilege
S1E3 / 08 Oct 2010
Officer Down
S1E4 / 15 Oct 2010
What You See
S1E5 / 22 Oct 2010
Smack Attack
S1E6 / 29 Oct 2010
Brothers
S1E7 / 05 Nov 2010
Chinatown
S1E8 / 12 Nov 2010
Re-do
S1E9 / 19 Nov 2010
After Hours
S1E10 / 03 Dec 2010
Little Fish
S1E11 / 19 Jan 2011
Family Ties
S1E12 / 26 Jan 2011
Hall of Mirrors
S1E13 / 02 Feb 2011
My Funny Valentine
S1E14 / 09 Feb 2011
Dedication
S1E15 / 18 Feb 2011
Age of Innocence
S1E16 / 25 Feb 2011
Silver Star
S1E17 / 11 Mar 2011
To Tell the Truth
S1E18 / 01 Apr 2011
Model Behavior
S1E19 / 08 Apr 2011
All That Glitters
S1E20 / 29 Apr 2011
Cellar Boy
S1E21 / 06 May 2011
The Blue Templar
S1E22 / 13 May 2011
Season 2
Mercy
S2E1 / 23 Sep 2011
Friendly Fire
S2E2 / 30 Sep 2011
Critical Condition
S2E3 / 07 Oct 2011
Innocence
S2E4 / 14 Oct 2011
A Night on the Town
S2E5 / 21 Oct 2011
Black and Blue
S2E6 / 04 Nov 2011
Lonely Hearts Club
S2E7 / 11 Nov 2011
Thanksgiving
S2E8 / 18 Nov 2011
Moonlighting
S2E9 / 02 Dec 2011
Whistle Blower
S2E10 / 06 Jan 2012
The Uniform
S2E11 / 13 Jan 2012
The Job
S2E12 / 03 Feb 2012
Leap of Faith
S2E13 / 10 Feb 2012
Parenthood
S2E14 / 17 Feb 2012
The Life We Chose
S2E15 / 24 Feb 2012
Women With Guns
S2E16 / 02 Mar 2012
Reagan V. Reagan
S2E17 / 09 Mar 2012
No Questions Asked
S2E18 / 30 Mar 2012
Some Kind of Hero
S2E19 / 06 Apr 2012
Working Girls
S2E20 / 27 Apr 2012
Collateral Damage
S2E21 / 04 May 2012
Mother's Day
S2E22 / 11 May 2012
Season 3
Family Business
S3E1 / 28 Sep 2012
Domestic Disturbance
S3E2 / 05 Oct 2012
Old Wounds
S3E3 / 12 Oct 2012
Scorched Earth
S3E4 / 19 Oct 2012
Risk and Reward
S3E5 / 26 Oct 2012
Greener Grass
S3E6 / 02 Nov 2012
Nightmares
S3E7 / 09 Nov 2012
Higher Education
S3E8 / 30 Nov 2012
Secrets and Lies
S3E9 / 07 Dec 2012
Fathers and Sons
S3E10 / 04 Jan 2013
Front Page News
S3E11 / 11 Jan 2013
Framed
S3E12 / 18 Jan 2013
Inside Jobs
S3E13 / 01 Feb 2013
Men in Black
S3E14 / 08 Feb 2013
Warriors
S3E15 / 15 Feb 2013
Quid Pro Quo
S3E16 / 22 Feb 2013
Protest Too Much
S3E17 / 08 Mar 2013
No Regrets
S3E18 / 15 Mar 2013
Loss of Faith
S3E19 / 05 Apr 2013
Ends and Means
S3E20 / 12 Apr 2013
Devil's Breath
S3E21 / 26 Apr 2013
The Bitter End
S3E22 / 03 May 2013
This Way Out
S3E23 / 10 May 2013
Season 4
Unwritten Rules
S4E1 / 27 Sep 2013
The City That Never Sleeps
S4E2 / 04 Oct 2013
To Protect and Serve
S4E3 / 11 Oct 2013
The Truth About Lying
S4E4 / 18 Oct 2013
Lost and Found
S4E5 / 25 Oct 2013
Growing Boys
S4E6 / 01 Nov 2013
Drawing Dead
S4E7 / 08 Nov 2013
Justice Served
S4E8 / 15 Nov 2013
Bad Blood
S4E9 / 22 Nov 2013
Mistaken Identity
S4E10 / 13 Dec 2013
Ties That Bind
S4E11 / 20 Dec 2013
The Bogeyman
S4E12 / 10 Jan 2014
Unfinished Business
S4E13 / 17 Jan 2014
Manhattan Queens
S4E14 / 31 Jan 2014
Open Secrets
S4E15 / 28 Feb 2014
Insult to Injury
S4E16 / 07 Mar 2014
Knockout Game
S4E17 / 14 Mar 2014
Righting Wrongs
S4E18 / 04 Apr 2014
Secret Arrangements
S4E19 / 11 Apr 2014
Custody Battle
S4E20 / 25 Apr 2014
Above and Beyond
S4E21 / 02 May 2014
Exiles
S4E22 / 09 May 2014
Season 5
Partners
S5E1 / 26 Sep 2014
Forgive and Forget
S5E2 / 03 Oct 2014
Burning Bridges
S5E3 / 10 Oct 2014
Excessive Force
S5E4 / 17 Oct 2014
Loose Lips
S5E5 / 24 Oct 2014
Most Wanted
S5E6 / 31 Oct 2014
Shoot the Messenger
S5E7 / 07 Nov 2014
Power of the Press
S5E8 / 21 Nov 2014
Under the Gun
S5E9 / 12 Dec 2014
Sins of the Father
S5E10 / 02 Jan 2015
Baggage
S5E11 / 09 Jan 2015
Home Sweet Home
S5E12 / 16 Jan 2015
Love Stories
S5E13 / 30 Jan 2015
The Poor Door
S5E14 / 06 Feb 2015
Power Players
S5E15 / 13 Feb 2015
In the Box
S5E16 / 20 Feb 2015
Occupational Hazards
S5E17 / 06 Mar 2015
Bad Company
S5E18 / 13 Mar 2015
Through the Looking Glass
S5E19 / 03 Apr 2015
Payback
S5E20 / 10 Apr 2015
New Rules
S5E21 / 24 Apr 2015
The Art of War
S5E22 / 01 May 2015
Season 6
Worst Case Scenario
S6E1 / 25 Sep 2015
Absolute Power
S6E2 / 02 Oct 2015
All the News That's Fit to Click
S6E3 / 09 Oct 2015
With Friends Like These
S6E4 / 16 Oct 2015
Backstabbers
S6E5 / 23 Oct 2015
Rush to Judgment
S6E6 / 30 Oct 2015
The Bullitt Mustang
S6E7 / 06 Nov 2015
Unsung Heroes
S6E8 / 13 Nov 2015
Hold Outs
S6E9 / 20 Nov 2015
Flags of Our Fathers
S6E10 / 11 Dec 2015
Back in the Day
S6E11 / 08 Jan 2016
Cursed
S6E12 / 15 Jan 2016
Stomping Grounds
S6E13 / 22 Jan 2016
The Road to Hell
S6E14 / 12 Feb 2016
Fresh Start
S6E15 / 19 Feb 2016
Help Me Help You
S6E16 / 26 Feb 2016
Friends in Need
S6E17 / 11 Mar 2016
Town Without Pity
S6E18 / 01 Apr 2016
Blast from the Past
S6E19 / 08 Apr 2016
Down the Rabbit Hole
S6E20 / 15 Apr 2016
The Extra Mile
S6E21 / 29 Apr 2016
Blowback
S6E22 / 06 May 2016
Season 7
The Greater Good
S7E1 / 23 Sep 2016
Good Cop Bad Cop
S7E2 / 30 Sep 2016
The Price of Justice
S7E3 / 07 Oct 2016
Mob Rules
S7E4 / 14 Oct 2016
For the Community
S7E5 / 21 Oct 2016
Whistleblowers
S7E6 / 28 Oct 2016
Guilt By Association
S7E7 / 04 Nov 2016
Personal Business
S7E8 / 11 Nov 2016
Confessions
S7E9 / 18 Nov 2016
Unbearable Loss
S7E10 / 09 Dec 2016
Genetics
S7E11 / 06 Jan 2017
Not Fade Away
S7E12 / 13 Jan 2017
The One That Got Away
S7E13 / 20 Jan 2017
In & Out
S7E14 / 03 Feb 2017
Lost Souls
S7E15 / 10 Feb 2017
Hard Bargain
S7E16 / 17 Feb 2017
Shadow of a Doubt
S7E17 / 10 Mar 2017
A Deep Blue Goodbye
S7E18 / 31 Mar 2017
Love Lost
S7E19 / 07 Apr 2017
No Retreat, No Surrender
S7E20 / 14 Apr 2017
Foreign Interference
S7E21 / 28 Apr 2017
The Thin Blue Line
S7E22 / 05 May 2017
Season 8
Cutting Losses
S8E1 / 29 Sep 2017
Ghosts of the Past
S8E2 / 06 Oct 2017
The Enemy of My Enemy
S8E3 / 13 Oct 2017
Out of the Blue
S8E4 / 20 Oct 2017
The Forgotten
S8E5 / 27 Oct 2017
Brushed Off
S8E6 / 03 Nov 2017
Common Ground
S8E7 / 10 Nov 2017
Pick Your Poison
S8E8 / 17 Nov 2017
Pain Killers
S8E9 / 01 Dec 2017
Heavy Is the Head
S8E10 / 08 Dec 2017
Second Chances
S8E11 / 05 Jan 2018
The Brave
S8E12 / 12 Jan 2018
Erasing History
S8E13 / 19 Jan 2018
School of Hard Knocks
S8E14 / 02 Feb 2018
Legacy
S8E15 / 02 Mar 2018
Tale of Two Cities
S8E16 / 09 Mar 2018
Close Calls
S8E17 / 30 Mar 2018
Friendship, Love, and Loyalty
S8E18 / 06 Apr 2018
Risk Management
S8E19 / 13 Apr 2018
Your Six
S8E20 / 27 Apr 2018
The Devil You Know
S8E21 / 04 May 2018
My Aim is True
S8E22 / 11 May 2018
Season 9
Playing with Fire
S9E1 / 28 Sep 2018
Meet the New Boss
S9E2 / 05 Oct 2018
Mind Games
S9E3 / 12 Oct 2018
Blackout
S9E4 / 19 Oct 2018
Thicker Than Water
S9E5 / 26 Oct 2018
Trust
S9E6 / 02 Nov 2018
By Hook or by Crook
S9E7 / 09 Nov 2018
Stirring the Pot
S9E8 / 16 Nov 2018
Handcuffs
S9E9 / 30 Nov 2018
Authority Figures
S9E10 / 07 Dec 2018
Disrupted
S9E11 / 04 Jan 2019
Milestones
S9E12 / 11 Jan 2019
Ripple Effect
S9E13 / 01 Feb 2019
My Brother's Keeper
S9E14 / 08 Feb 2019
Blues
S9E15 / 15 Feb 2019
Past Tense
S9E16 / 08 Mar 2019
Two-faced
S9E17 / 15 Mar 2019
Rectify
S9E18 / 05 Apr 2019
Common Enemies
S9E19 / 12 Apr 2019
Strange Bedfellows
S9E20 / 26 Apr 2019
Identity
S9E21 / 03 May 2019
Something Blue
S9E22 / 10 May 2019
Season 10
The Real Deal
S10E1 / 27 Sep 2019
Naughty or Nice
S10E2 / 04 Oct 2019
Behind the Smile
S10E3 / 11 Oct 2019
Another Look
S10E4 / 18 Oct 2019
The Price You Pay
S10E5 / 25 Oct 2019
Glass Houses
S10E6 / 01 Nov 2019
Higher Standards
S10E7 / 08 Nov 2019
Friends in High Places
S10E8 / 15 Nov 2019
Grave Errors
S10E9 / 22 Nov 2019
Bones to Pick
S10E10 / 06 Dec 2019
Careful What You Wish For
S10E11 / 03 Jan 2020
Where the Truth Lies
S10E12 / 10 Jan 2020
Reckless
S10E13 / 31 Jan 2020
Fog of War
S10E14 / 14 Feb 2020
Vested Interests
S10E15 / 06 Mar 2020
The First 100 Days
S10E16 / 13 Mar 2020
The Puzzle Palace
S10E17 / 03 Apr 2020
Hide in Plain Sight
S10E18 / 24 Apr 2020
Family Secrets
S10E19 / 01 May 2020
Season 11
Triumph Over Trauma
S11E1 / 04 Dec 2020
In the Name of the Father
S11E2 / 11 Dec 2020
Atonement
S11E3 / 18 Dec 2020
Redemption
S11E4 / 08 Jan 2021
Spilling Secrets
S11E5 / 22 Jan 2021
The New Normal
S11E6 / 05 Feb 2021
In Too Deep
S11E7 / 12 Feb 2021
More Than Meets the Eye
S11E8 / 05 Mar 2021
For Whom the Bell Tolls
S11E9 / 26 Mar 2021
The Common Good
S11E10 / 02 Apr 2021
Guardian Angels
S11E11 / 09 Apr 2021
Happy Endings
S11E12 / 16 Apr 2021
Fallen Heroes
S11E13 / 30 Apr 2021
The New You
S11E14 / 07 May 2021
The End
S11E15 / 14 May 2021
Justifies the Means
S11E16 / 14 May 2021
Season 12
Hate Is Hate
S12E1 / 01 Oct 2021
Times Like These
S12E2 / 08 Oct 2021
Protective Instincts
S12E3 / 15 Oct 2021
True Blue
S12E4 / 22 Oct 2021
Good Intentions
S12E5 / 05 Nov 2021
Be Smart or Be Dead
S12E6 / 12 Nov 2021
USA Today
S12E7 / 19 Nov 2021
Reality Check
S12E8 / 03 Dec 2021
Firewall
S12E9 / 10 Dec 2021
Old Friends
S12E10 / 07 Jan 2022
On the Arm
S12E11 / 14 Jan 2022
The Reagan Way
S12E12 / 21 Jan 2022
Cold Comfort
S12E13 / 28 Jan 2022
Allegiance
S12E14 / 25 Feb 2022
Where We Stand
S12E15 / 04 Mar 2022
Guilt
S12E16 / 11 Mar 2022
Hidden Motive
S12E17 / 01 Apr 2022
Long Lost
S12E18 / 08 Apr 2022
Tangled Up in Blue
S12E19 / 29 Apr 2022
Silver Linings
S12E20 / 06 May 2022
Season 13
Keeping the Faith
S13E1 / 07 Oct 2022
First Blush
S13E2 / 14 Oct 2022
Ghosted
S13E3 / 21 Oct 2022
Life During Wartime
S13E4 / 28 Oct 2022
Homefront
S13E5 / 04 Nov 2022
On Dangerous Ground
S13E6 / 18 Nov 2022
Heroes
S13E7 / 02 Dec 2022
Poetic Justice
S13E8 / 09 Dec 2022
Nothing Sacred
S13E9 / 06 Jan 2023
Fake It Till You Make It
S13E10 / 13 Jan 2023
Lost Ones
S13E11 / 20 Jan 2023
The Big Leagues
S13E12 / 03 Feb 2023
Past History
S13E13 / 10 Feb 2023
Collision Course
S13E14 / 03 Mar 2023
Close to Home
S13E15 / 10 Mar 2023
The Naked Truth
S13E16 / 31 Mar 2023
Smoke & Mirrors
S13E17 / 07 Apr 2023
Family Matters
S13E18 / 21 Apr 2023
Fire Drill
S13E19 / 05 May 2023
Irish Exits
S13E20 / 12 May 2023
Forgive Us Our Trespasses
S13E21 / 19 May 2023
Season 14
Loyalty
S14E1 / 16 Feb 2024
Dropping Bombs
S14E2 / 23 Feb 2024
Fear No Evil
S14E3 / 01 Mar 2024
Past Is Present
S14E4 / 15 Mar 2024
Bad Faith
S14E5 / 05 Apr 2024
Shadowland
S14E6 / 12 Apr 2024
On the Ropes
S14E7 / 26 Apr 2024
Wicked Games
S14E8 / 03 May 2024
Two of a Kind
S14E9 / 10 May 2024
The Heart of a Saturday Night
S14E10 / 17 May 2024
Life Sentence
S14E11 / 18 Oct 2024
Without Fear or Favor
S14E12 / 25 Oct 2024
Bad to Worse
S14E13 / 01 Nov 2024
New York Minute
S14E14 / 08 Nov 2024
No Good Deed
S14E15 / 15 Nov 2024
The Gray Areas
S14E16 / 22 Nov 2024
Entitlement
S14E17 / 06 Dec 2024
End of Tour
S14E18 / 13 Dec 2024
Tom Selleck
Frank Reagan
Donnie Wahlberg
Danny Reagan
Bridget Moynahan
Erin Reagan-Boyle
Will Estes
Jamie Reagan
Len Cariou
Henry Reagan
Gregory Jbara
Garrett Moore
