Home / Series / Blue Bloods / Aired Order / Season 8 / Episode 21
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The Devil You Know

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. Also, when Erin obtains information about an impending murder from a shady source, she gets Danny and Baez involved, despite the questionable agenda of the informant, and Jamie and Eddie try to locate a woman who kidnapped a newborn baby.

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  • Originally Aired May 4, 2018
  • Runtime 45 minutes
  • Content Rating United States of America TV-14
  • Production Code BB821
  • Network CBS
  • On Other Sites IMDB
  • Created July 13, 2019 by
    Administrator admin
  • Modified July 13, 2019 by
    Administrator admin
Name Type Role
Peter Blauner Writer
Bebe Neuwirth Guest Star
John Behring Director