Blue Bloods Season 8 Episode 21: "The Devil You Know" Photos

John Romano - Blue Bloods

Erin takes a chance on John Romano's information in order to save a life on Blue Bloods. "The Devil You Know" is the 21st episode of the show's eighth season.
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Believing an Informant - Blue Bloods

Erin decides to look into an informant's story despite Danny and Anthony's resistance on Blue Bloods. "The Devil You Know" is the 21st episode of the show's eighth season.
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A Kidnapped Newborn - Blue Bloods

Jamie and Eddie search for a woman who kidnapped a newborn on Blue Bloods. "The Devil You Know" is the 21st episode of the show's eighth season.
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Blue Bloods Season 8 Episode 21 Quotes

I'll allow that you're half right about a very complicated subject, and I'll go take another run at Martin Post.

Kelly

They couldn't put out a joint statement saying the sky is blue.

Sid

Blue Bloods Season 8 Episode 21

Blue Bloods Season 8 Episode 21 Photos

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