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Blue Bloods S8E21 poster

Watch Blue Bloods – Season 8 Episode 21: The Devil You Know

Blue Bloods • Season 8, Episode 21 • 45 min • 2010 • ⭐ 7.8/10 • Crime , Drama

Cast: Tom Selleck , Donnie Wahlberg , Bridget Moynahan , Will Estes , Len Cariou , Gregory Jbara , Abigail Hawk

Directors: Robin Green , Mitchell Burgess

Watch Blue Bloods – S8E21

Episode Overview

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.

Episode Navigation

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