Blue Bloods - Season 8 Episode 21 The Devil You Know
Frank locks horns with a data-tracking company when it refuses to unlock a terrorist's phone that may hold information regarding upcoming targets; Erin obtains information about an impending murder from a shady source; a woman kidnaps a baby.
- Genre: Crime, Drama
- Studio: CBS
- Keyword: new york city, police, police station, police commissioner, police procedural
- Cast: Tom Selleck, Donnie Wahlberg, Bridget Moynahan, Will Estes, Len Cariou, Gregory Jbara
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