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What "Blue Bloods" 21-th episode about
Frank goes head-to-head with a data-tracking company when they refuse to unlock the phone of a terrorist that may hold information regarding upcoming targets. Also, when Erin obtains information about an impending cuddle from a shady source, she gets Danny and Baez involved, despite the questionable agenda of the informant, and Jamie and Eddie try to locate a woman who kidnapped a newborn baby.
Episode number: 21
Episode name: "The Devil You Know"
Episode release date: 5 may 2018 at 02:00
Status: aired
Rating: 7.8