Why did Danny's brother steal his credit card?
That was the big question on Blue Bloods Season 8 Episode 17 when Danny had to use all of the resources available to get some big results.
Meanwhile, Frank asked Erin and Anthony to investigate if his old partner was truly guilty of a crime, but what did they find out?
Also, Jamie was asked for some help from an officer who wanted a new assignment.
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Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.