A criminal from Danny's past kidnaps Jackie; Jamie meets his new partner; an officer accidentally shoots an innocent man.
Danny and Jackie discover that a woman who recanted an abuse claim is in a relationship with a powerful councilman; Linda returns to work, causing upheaval for Danny.
When two murder victims turn out to be members of the same group, Danny suspects a serial killer; Erin faces off with her ex-husband in court.
A bride is murdered on her wedding day in a gang shooting; when Vinny performs an unjustified stop, Jamie questions his partner's methods.
Soon after Frank honors a detective with an award for his undercover work in Malaysia, the detective is captured by a Malaysian drug lord; Henry accompanies Jamie on a ride-along.
Erin asks Danny to protect her key witness, a notorious photographer, after a nearly fatal hit-and-run accident; Vinny and Jamie go after a drug operation.
When a man is stabbed by an attacker dressed as the spirit of death, Danny investigates a voodoo community; Garrett tells Frank about a dark secret; Nicky and Erin take Jack and Sean trick-or-treating.
Danny finds a murdered student at a college campus; after reconnecting with a former law-school classmate, Jamie has a life crisis; Erin tries to give Nicky some freedom.
Linda helps with a shooting investigation when she hears the victim reveal who was responsible; Jamie is enraged when Henry is mugged.
When two different people driving gas-guzzling vehicles are killed by a sniper, the city thinks a radical environmental serial killer is responsible; Danny's son is severely injured in a bicycle accident.
Jamie's career hangs in the balance when he shoots an armed man in a tourist spot, leading Danny to conduct an investigation into the gunman.
When Danny is pulled over because his car matches the description of one involved in a drug deal, police find cocaine in his trunk; Danny's family rallies to come to his defense.
Danny investigates when a man covered in rat bites is thrown from a moving vehicle; Frank deals with a bigoted radio host who will be working in New York.
When a Hasidic Grand Rebbe and his new appointee both die, Danny investigates members of the Hasidic community.
When an incident in the projects leads to the death of a 10-year-old boy, Danny's reaction lands him in anger-management class; Frank tries to help a young Turkish woman avoid persecution.
Danny and Erin investigate a cold case in which a rich and powerful man allegedly attacked his girlfriend; an injury during a pick-up game leads to a lawsuit.
An off-duty cop is disarmed by bank robbers and an innocent bystander is wounded; Frank starts to fall for a woman from ACLU.
When the same tragedy occurs to multiple people in New York, Danny must determine what connects them and who is responsible; Frank tries to help a friend face his alcoholism.
When a devout young woman is murdered, Danny questions her family; a secret relationship is uncovered.
When two Wall Street brokers are killed during drug deals, Linda bars Danny from questioning a wounded accomplice until after the man has had surgery.
Danny is suspicious when he encounters a disoriented man covered in blood; Jamie helps an off-duty officer conceal his intoxication after apprehending an armed robber.
Danny is upset when a woman he promised to help commits suicide; the Reagan family suffers a loss due to a gang.