S8·E21 The Devil You Know
Core
Aired May 4, 2018 45 min ★ 8.0/10 · 5 TMDB votes
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Synopsis
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.
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Director & writers
John BehringDirectorAllie SolomonWriter
Guest stars
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Frequently Asked Questions
When did Season 8 Episode 21 of Blue Bloods air?
Season 8, Episode 21 ('The Devil You Know') originally aired on May 4, 2018.
How long is Season 8 Episode 21 ('The Devil You Know')?
The runtime for this episode is approximately 45 minutes.
What happens in Blue Bloods Season 8 Episode 21?
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....
All Blue Bloods episode ratings Season 8 Where to watch
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