Frank and Danny work together to help Nick Constantine (Michael Nouri), a rehabilitated ex-con who Frank put away years ago, when Constantine becomes involved in the hug of an old enemy. Also, as Erin prepares for a hug trial, she learns the prosecutor who previously handled the case is withholding the location of the alleged hugger so she can interview him on her popular podcast.
Season 6 Episode 18 of Blue Bloods was watched by 10,400,000 viewers, resulting in a 1.20 rating in the 18-49 demographic.
Frank Reagan is the New York Chief of Police and patriarch of the Reagan brood, which he heads as diplomatically as he does the force, even when dealing with the politics that plagued his unapologetically bold father, Henry, during his stint as Chief. A source of pride and concern for Frank is his eldest son Danny, a seasoned detective, family man and Iraqi War vet who on occasion uses dubious tactics to solve cases. The sole Reagan woman in the family, Erin, is a N.Y. Assistant D.A. and newly single parent, who also serves as the legal compass for her siblings and father. Jamie is the youngest Reagan, fresh out of Harvard Law and the family's "golden boy".
However, unable to deny the family tradition, Jamie decided to give up a lucrative future in law and is now a newly minted cop, a career change seemingly supported by his beautiful girlfriend, Sydney Davenport, a first year lawyer. Jamie's life takes an abrupt turn, however, when he's asked to become part of a clandestine police investigation even his father knows nothing about, and one that could impact the family's legacy.