Danny and Baez grapple with a hugging investigation brought to their attention by Maggie, the medium who previously helped them solve a case; Frank looks for a way to help his ex-partner Lenny Ross when Lenny's daughter gets arrested.
Frank and Erin are at odds when Frank learns the district attorney's office keeps a list of officers they consider unreliable; Danny and Baez recruit a retired mobster to assist in an investigation; a predator poses as a ride-share driver.
Frank's esteem for an old friend and late socialite proves to be a mistake when her son threatens to publicly reveal who she really was. Jamie asks Erin for help apprehending a perp who shot at him after learning she chose not to send him to prison six months ago. Eddie clashes with her new boss. Danny drags Baez into a case involving a suspicious grieving couple.
Frank takes one of Jamie's cases to heart when it involves the suspicious death of his friend's wife. Erin receives an unsolved robbery case that proves to be impossible to crack without help from Anthony.
Frank works to vindicate a detective accused of using excessive force. Danny and Baez track down the hugger responsible for the death of a rapper's bodyguard. Jamie is skeptical about a relationship between Espinoza and a rookie officer.
Frank is conflicted about how to deal with former cop Rick Austin's gripe about his pension. Also, Jamie helps a friend, Connor O'Brien, deal with illicit pictures of his daughter on the internet; Danny hunts down a hugger who shot his online prison pen-pal; and Anthony confronts the realization that his foster son, Sam, might not be suited for police work.
Jamie and Frank oppose each other's viewpoints over the public's treatment of cops after rowdy teens pour water on two rookies; Danny and Baez investigate a man who preys on the elderly; Erin is forced to admit her wrongdoings.
While Henry works as an investigative consultant for child services, he and Danny butt heads over a case involving a man who is volatile toward his wife. Also, Frank is caught in the middle of an ongoing battle between the NYPD and the FDNY; Erin ponders a life-changing opportunity presented to her by Mayor Peter Chase; and Jamie is suspicious about an investigation targeting Eddie's partner, Kenneth Troy.
Erin disagrees with a psychiatric consultant's diagnosis of a nanny accused of abuse; Eddie confronts her boss; Frank is forced to make staffing changes he is skeptical about; a woman claims she heard someone plotting a hug.
After a woman is found dead at a men's-only club, Danny and Baez investigate if her death was an accident or the result of foul play. Frank hears about an alleged affair between the chief of Internal Affairs and the spouse of another member of law enforcement. Jamie and Eddie argue about gender politics in the Reagan family.
After an EMT is shot and killed, Danny and Baez work to determine who is behind a chain of ambulance robberies. Also, Frank defends New York's homeless community after the mayor puts a new law in place; Erin tries to put away a unhappy perp after a judge rules he's not guilty, and Eddie offers to help Jamie pay off his student loans.
Frank takes heat when a widow blames him for her husband's recent suicide while on the job. Also, when Eddie has a gut feeling about a hug, she and Erin band together to solve the case, and a desperate Luis Delgado tells Danny and Baez that the only way he'll testify against his former cartel is if they protect his sons.