Eddie and James attempt to steal a collar from a pompous detective. An officer is outed and his partner refuses to ride with him. Danny and Baez are asked to work with new partners. Elsewhere Frank speaks out about equality on the force.
Frank and Danny become determined to make sure that an international felon who always manages to walk away from murder charges ends up behind bars. Erin thinks about going into private practice after she looks into college costs for Nicky. Danny clashes with his new boss.
Danny is conflicted when he learns that a group of highly trained Army veterans are responsible for a robbery. Meanwhile, after a bomb scare in a subway turns out to be the work of a famous street artist, Garrett and Gormley argue about how to deal with the fallout.
Jamie gets Danny involved when he finds a homeless teen who claims his aunt was killed by her boyfriend. Meanwhile, Erin is angered when McCoy replaces her as the prosecutor on a case involving a corrections officer.
Danny and Baez investigate when a homeowner shoots an intruder, only to find out that, the intruder is a hit man. Also, a young attorney attempts to bring justice to his mother who Erin put away on a murder charge 12 years ago
Danny and Baez investigate a murder of a lower income resident in a luxury building where 20 percent of the units are made affordable for lower income housing. Also, Frank takes issue with a detective friend of Gormley’s who takes advantage of his position with legal loopholes.
When a star witness in a double murder case drops out, Erin is tasked with bringing a protected mob informant back to New York for a case and keeping him safe, with help from Danny and Baez. Also, Frank enters into tense negotiations with Mayor Poole about police officer benefits.
When an emotionally distraught man holds Baez hostage at gunpoint in an interrogation room after she served him with a restraining order, Danny must try to meet his demands before he harms Frank is faced with a personal and moral dilemma when Garrett asks for help in dropping charges filed against his son.
Erin is rattled when an unknown assailant breaks into her apartment and also attacks her co-worker. Meanwhile, Jamie and Eddie discover a pipe bomb in an elderly woman’s apartment, and Frank looks into a charity that is soliciting money for the NYPD.
Eddie goes on her first undercover operation to investigate a kidnapping ring targeting young women via fake youth hostel websites. Meanwhile, Frank helps a woman he knows from early in his career meet the inmate who killed her family.
Frank goes toe to toe with an investigative journalist who refuses to give up her source, despite the source admitting to committing murder. Also, Danny is paired with a troubled teenager as part of an NYPD program aimed at influencing youth to make better decisions.
When a suspect voluntarily admits to killing a reality show celebrity chef in his own restaurant, Danny and Baez are convinced the suspect is taking the fall for someone. Also, Frank faces a moral dilemma when a longtime friend, Sen. Ted McCreary, asks for Frank’s help to make a DUI go away, and investigative journalist Anne Farrell returns.
When NYPD Deputy Chief Donald Kent, a commanding officer of the gang division, and his wife are gunned down in an apparent gang hit, Frank orders all hands on deck to catch his friend’s killer. Working the case, Danny and Baez go see Mario Hunt, a well-known member of a deadly gang, in the first of a two-part season finale.
When a member of the Reagan clan is shot, Danny’s tries to track down the gang member responsible, without letting his emotions get the best of him. Also, he must get creative in order to bring in witnesses.