Blue Bloods Season 8 Episode 21 The Devil You Know 2017
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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.
- Released: 2018-05-04
- Runtime: 60 minutes
- Genre: Crime, Drama
- Stars: Tom Selleck, Donnie Wahlberg, Bridget Moynahan, Will Estes, Len Cariou
- Director: Mitchell Burgess, Robin Verde, Charles McClelland, Robin Green
- Source: CWR-CRB
