Watch Blue Bloods Online: Season 7 Episode 21

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Did Erin find out the truth?

That was a key question on Blue Bloods Season 7 Episode 21 when she realized that someone tampered with her evidence. 

Meanwhile, Danny and Baez teamed up with Russian operatives to search for a dangerous man who entered the country on a diplomatic visa. 

Did they find him before it was too late?

Also, Frank got involved with a case concerning the archbishop. 

Use the video above to watch Blue Bloods online to get up to speed with the latest drama for the characters. 

Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.

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Blue Bloods Season 7 Episode 21 Quotes

Garrett: We both knew this issue would land on our desk sooner or later.
Frank: It didn't just land, it was placed by the mayor.

Frank: As far as I'm concerned if you worked that pile and got sick, you and your family should be taken care of, end of story.
Garrett: You're not an insurance claims adjustor.
Frank: For which I thank God every day.