After Briscoe, Curtis, McCoy, and Kincaid witness the execution of a criminal they brought to justice, their unique reactions to the event culminate in personal tragedies for each of them.

The investigation into multiple homicides at a clothing store leads to the arrest of a schizophrenic who presents McCoy with a formidable opponent when he decides to represent himself.

The family of a man who once turned his customers into the police is slain, and the ensuing fracas pits McCoy against a corrupt D.E.A. agent.

Briscoe and Green catch four murders and a kidnapping on the same day, and get handed confessions in each case.

While investigating the death of a teenaged girl, the detectives stumble on a pattern of crimes that indicate they are after a serial killer. The suspect, however, puts the prosecutors through an ethical ringer when he discloses his attorney's knowledge of the victims and their whereabouts.

When a man is found murdered shortly after depositing almost $400,000 in his savings account, the investigation into the source of funds reveals that the victim ran an identity theft scam which left an elderly man homeless and impoverished.

Detectives search for an anonymous blogger who has posted plans to blow up a school. Lt. Van Buren struggles to keep her personal issues private.

During the investigation into the death of a little girl in a respectable, middle-class family, Greevey and Logan uncover a myriad of family secrets involving abuse, molestation, and murder.

A shootout between a motorist and the police leads to the discovery of a gruesome Russian mob killing --- and a traumatized boy who was an eyewitness to the murder.

McCoy and Carmichael risk violating the civil liberties of witnesses when they are forced to jail them in order to safely continue their investigation.

When a woman is found murdered in Central Park, evidence points to two frequent park-goers: a street vendor and a tech billionaire. In the face of extreme political pressure, McCoy takes drastic action to make the case.

Cerreta poses as a weapons dealer to help Stone build a case against a Columbian hit man, but the deal takes an unexpected turn, resulting in bloodshed.

A skeleton unearthed at a building site resurrects one of Stone's old cases, and brings him face to face with the tenacious, brilliant culprit, who is seeking a new trial.

A truck hits a pedestrian and the investigation reveals the victim's link to a baby-food company in which a new partner has connections to the Russian mob.

The trial of Eddie Newman begins but the prosecution's chances of conviction are hampered by a "dream team" of defense attorneys, Gorton's personal pressures on Ross, the public questioning of the relationship between Curtis and Lisa Lundquist, and a surprise accusation.

The cops uncover a man with a secret second life as they try to learn who opened fire on a group of people disembarking from a party cruise, but his guilt or innocence becomes almost a second thought as Schiff goes toe to toe with the governor and the States Attorney General over the decision to seek the death penalty.

Briscoe bids farewell to the 27 as the prosecution of two women for killing each other's husbands comes to a successful conclusion.

The deaths of three women with the same name lead Fontana and Green to the nine-year-old conviction of Leland Barnes, who had shot and killed his wife in an office full of people. With two of the three witnesses against him dead and Jack McCoy on the hit list, the detectives struggle to determine how Barnes, who has been in prison the entire time, got someone on the outside to kill the only people who could keep him in jail. The investigation leads them to Leland's two sons, with surprising results.

Internal affairs takes a special interest in Detective Green after a gambler is found dead by his bullet, and the investigation turns up a part of his past he's taken pains to conceal.

The murder of the plaintiff in a high-profile lawsuit against a major airline leads detectives to a defense attorney (Dallas Roberts) who is willing to do whatever it takes to ensure his big payday.

A case that begins as a search for a missing witness spirals into a murder conspiracy with ADA Connie Rubirosa caught in the middle.

Dr. Olivet accuses her gynecologist of rape, but Stone finds his case in trouble when he discovers that Olivet tape-recorded the crime.

Curtis, angered by the attitude of an old colleague of Briscoe's, looks beyond the findings of an IAB investigation and turns up evidence of police corruption that puts the DA's office into competition with an ambitious judge and Briscoe under investigation for stealing evidence from a police lockup.

The cops' best hope of finding a kidnapped hired car driver alive is one of the armed robbers who grabbed him after a job, but the immunity deal he demands in return would effectively preclude his prosecution for the shooting death of an off-duty cop, placing McCoy in a difficult position as he seeks to placate the cops, who want the guy prosecuted, and the kidnapped man's wife, who wants every avenue of saving her husband explored.

Briscoe and Green believe a 10-year-old is responsible for a child's death, and McCoy wants her isolated to stop any future fatalities.