Release calendarTop 250 moviesMost popular moviesBrowse movies by genreTop box officeShowtimes & ticketsMovie newsIndia movie spotlight
    What's on TV & streamingTop 250 TV showsMost popular TV showsBrowse TV shows by genreTV news
    What to watchLatest trailersIMDb OriginalsIMDb PicksIMDb SpotlightFamily entertainment guideIMDb Podcasts
    OscarsEmmysToronto Int'l Film FestivalHispanic Heritage MonthIMDb Stars to WatchSTARmeter AwardsAwards CentralFestival CentralAll events
    Born todayMost popular celebsCelebrity news
    Help centerContributor zonePolls
For industry professionals
  • Language
  • Fully supported
  • English (United States)
    Partially supported
  • Français (Canada)
  • Français (France)
  • Deutsch (Deutschland)
  • हिंदी (भारत)
  • Italiano (Italia)
  • Português (Brasil)
  • Español (España)
  • Español (México)
Watchlist
Sign in
  • Fully supported
  • English (United States)
    Partially supported
  • Français (Canada)
  • Français (France)
  • Deutsch (Deutschland)
  • हिंदी (भारत)
  • Italiano (Italia)
  • Português (Brasil)
  • Español (España)
  • Español (México)
Use app
Blue Bloods
S8.E21
All episodesAll
  • Cast & crew
  • User reviews
  • Trivia
IMDbPro

The Devil You Know

  • Episode aired May 4, 2018
  • TV-14
  • 41m
IMDb RATING
7.8/10
369
YOUR RATING
Will Estes and Vanessa Ray in Blue Bloods (2010)
CrimeDramaMysteryThriller

Frank goes head-to-head with a data-tracking company when they refuse to unlock the phone of a terrorist that may hold information regarding upcoming targets.Frank goes head-to-head with a data-tracking company when they refuse to unlock the phone of a terrorist that may hold information regarding upcoming targets.Frank goes head-to-head with a data-tracking company when they refuse to unlock the phone of a terrorist that may hold information regarding upcoming targets.

  • Director
    • John Behring
  • Writers
    • Robin Green
    • Mitchell Burgess
    • Peter Blauner
  • Stars
    • Donnie Wahlberg
    • Bridget Moynahan
    • Will Estes
  • See production info at IMDbPro
  • IMDb RATING
    7.8/10
    369
    YOUR RATING
    • Director
      • John Behring
    • Writers
      • Robin Green
      • Mitchell Burgess
      • Peter Blauner
    • Stars
      • Donnie Wahlberg
      • Bridget Moynahan
      • Will Estes
    • 1User review
  • See production info at IMDbPro
  • See production info at IMDbPro
  • Photos13

    View Poster
    View Poster
    View Poster
    View Poster
    View Poster
    + 9
    View Poster

    Top cast29

    Edit
    Donnie Wahlberg
    Donnie Wahlberg
    • Danny Reagan
    Bridget Moynahan
    Bridget Moynahan
    • Erin Reagan
    Will Estes
    Will Estes
    • Jamie Reagan
    Len Cariou
    Len Cariou
    • Henry Reagan
    Sami Gayle
    Sami Gayle
    • Nicky Reagan-Boyle
    Tom Selleck
    Tom Selleck
    • Frank Reagan
    Marisa Ramirez
    Marisa Ramirez
    • Maria Baez
    • (credit only)
    Vanessa Ray
    Vanessa Ray
    • Eddie Janko
    John Pankow
    John Pankow
    • John Romano
    Gregory Jbara
    Gregory Jbara
    • Garrett Moore
    Robert Clohessy
    Robert Clohessy
    • Sid Gormley
    Abigail Hawk
    Abigail Hawk
    • Abigail Baker
    Steve Schirripa
    Steve Schirripa
    • Anthony Abetemarco
    • (as Steven R. Schirripa)
    Nellie Campbell
    • Sofia
    Gil Perez-Abraham
    • Jorge
    Mike Donovan
    Mike Donovan
    • John Romano Jr.
    Christopher Shyer
    Christopher Shyer
    • Martin Post
    Tony Terraciano
    Tony Terraciano
    • Jack Reagan
    • Director
      • John Behring
    • Writers
      • Robin Green
      • Mitchell Burgess
      • Peter Blauner
    • All cast & crew
    • Production, box office & more at IMDbPro

    User reviews1

    7.8369
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10

    Best Emmys Moments

    Best Emmys Moments
    Discover nominees and winners, red carpet looks, and more from the Emmys!

    Related interests

    James Gandolfini, Edie Falco, Sharon Angela, Max Casella, Dan Grimaldi, Joe Perrino, Donna Pescow, Jamie-Lynn Sigler, Tony Sirico, and Michael Drayer in The Sopranos (1999)
    Crime
    Mahershala Ali and Alex R. Hibbert in Moonlight (2016)
    Drama
    Jack Nicholson and Faye Dunaway in Chinatown (1974)
    Mystery
    Cho Yeo-jeong in Parasite (2019)
    Thriller

    Storyline

    Edit

    Did you know

    Edit
    • Trivia
      Once again, Frank is played contrary to Tom Selleck's Libertarian leanings in that he is willing to sacrifice privacy for perceived safety by circumventing the 4th Amendment in order to access information on a phone. The scenario here is "ripped from the headlines" where in 2016 the FBI was denied access by Apple to their phone's software. The FBI eventually used a third party to obtain the data from the phone.
    • Quotes

      Anthony Abetemarco: John Romano must be laughing his ass off, thinking about us sitting here all night, waiting to watch a so-called hit go down.

      Danny Reagan: You know, you are welcomed to leave if you want. Go home, put on your nice jammies, dunk a glass of warm milk, but I'm staying.

      Anthony Abetemarco: Why? You that afraid of your sister?

      Danny Reagan: I'm not afraid of my sister, okay? I just can't stand when she says, "I told you so."

      Anthony Abetemarco: Ah, she's pretty decent about that. Usually. Not rubbing your in the dirt.

      Danny Reagan: Yeah, but when she does it, you feel it.

      Anthony Abetemarco: Erin's all right. She just doesn't look at it like a cop. She sees both sides.

    Top picks

    Sign in to rate and Watchlist for personalized recommendations
    Sign in

    Details

    Edit
    • Release date
      • May 4, 2018 (United States)
    • Language
      • English
    • Production companies
      • Panda Productions Inc.
      • CBS Television Studios
    • See more company credits at IMDbPro

    Tech specs

    Edit
    • Runtime
      • 41m
    • Color
      • Color
    • Sound mix
      • Stereo
    • Aspect ratio
      • 16:9 HD

    Contribute to this page

    Suggest an edit or add missing content
    • Learn more about contributing
    Edit page

    More to explore

    Recently viewed

    Please enable browser cookies to use this feature. Learn more.
    Get the IMDb App
    Sign in for more accessSign in for more access
    Follow IMDb on social
    Get the IMDb App
    For Android and iOS
    Get the IMDb App
    • Help
    • Site Index
    • IMDbPro
    • Box Office Mojo
    • License IMDb Data
    • Press Room
    • Advertising
    • Jobs
    • Conditions of Use
    • Privacy Policy
    • Your Ads Privacy Choices
    IMDb, an Amazon company

    © 1990-2025 by IMDb.com, Inc.