A quadruple homicide with sexual overtones is just the start of an intense rampage of a serial killer that brings a homicide detective into the mix. As the entire squad races against time to prevent further victims, the evidence uncovers a horrible situation of incest and abuse.

A female party-goer and rape victim claims self-defense after killing her attacker. Events take an unusual turn when they find out that the victim is a pre-operative transgender.

A dead girl is found outside a bar. The death, however, is ruled a suicide, because the victim's boyfriend continually raped her. The victim's father vows revenge against his daughter's rapist.

A murdered 14-year-old girl leads the detectives to a prominent physician who specializes in reproduction therapy and exposes a dangerous "foundation" where disenfranchised young women are brainwashed.

A woman with a high-risk pregnancy disappears and her ex-boyfriend, who's the father, and engaged to the boss' daughter, is under suspicion. In a race against time to find her as her delivery date approaches, Benson and Stabler are faced with more than one suspect willing to take the fall for the crime.

Detectives enlist Dr. Huang's help as they investigate the deaths of two high-school basketball players gunned down while shooting hoops in the gymnasium and the connection to an illegal marketing campaign by a major pharmaceutical company.

Benson and Stabler have trouble identifying a male murder victim in his 20's found in a pile of sheets in the West Village; they later suspect an outspoken minister who was in the process of flooding the victim with hate mail and death threats. When the activist's alibi checks out, the detectives turn their attention to a professor who objects to the victim's thesis on the failure of sexual re-education groups.

A subway commuter is found castrated and bleeding profusely, leading the detectives to discover their "victim" may be the perpetrator in abducting women and forcing them to live in his dungeon for several years as his bride. As the detectives prepare to arrest their victim turned suspect, Benson arrives to find him murdered.

The discovery of a beaten infant leads detectives on a search for the attacker, who may be a pedophile. When the medical evidence shows the injuries were a result of shaken baby syndrome, their focus shifts to those closest to the child: her mother, the mother's boyfriend and the nannies.

When the body of young man is found in a tank at a wastewater treatment plant, the medical examiner identifies a tattoo that says TE, the symbol for the fraternity Tau Omega. The investigation into the murder and sodomy of this local fraternity pledge master leads the detectives to his pornographic website featuring college girls at a local bar.

A young Arab woman is brutally raped and burned, and after identifying her, the detectives suspect her husband and mother-in-law. After a man accused of the murders of three Arabs, he claims that he was genetically and biologically predisposed to hatred and violence, but soon they uncover the real impetus to the slayings.

The conviction of a group of sociopathic high school bullies who turned on one of their own escalates into even more violence and death in their exclusive private school.

Detectives try to decipher a motive for the strangulation of a Bronx assistant DA in an area where hookers stroll. When the death of the prosecutor looks staged using information gleaned from a co-worker's caseload, Novak endangers her career to obtain a confession.

When it becomes obvious that a forensics expert raped and murdered a student, the investigation focuses on a criminology professor Cragen arrested decades earlier for similar crimes, but is the professor a perpetrator or a victim?

A woman claiming to have been the victim of rape commits suicide while she is still in the emergency room.

The death of a wealthy senior citizen leads to an investigation that uncovers a serial killer with childhood abandonment issues who targets the elderly.

A missing teenager found beaten and tied up in a college dormitory under construction claims that she was raped by three students, but as the investigation proceeds and information obtained by the police and the press causes her story to unravel quickly, the girl recants. Since Benson remains convinced that a rape did occur, the focus of the investigation shifts to the girl's overly-protective stepfather who has resisted the investigation from its onset.

After arguing with Benson about their personal lives, Stabler enlists the help of a former cop turned psychiatrist in apprehending a serial rapist and murderer who attacks disabled women.

Fin is reunited with his own son as he risks his life to save two small children, one caught in the middle of a bodega robbery and the other from the junkie who set the child's mother up for murder and then stole him to use as a front in her scheme to boost materials for her meth lab.

Fourteen years ago, Stabler had a chance to nail Gordon Rickett for the abduction, rape and murder of Dana MacNamara, but Rickett managed to get off. With the recent discovery of the body of Kerry Lynn Palmer, Stabler has another chance at cracking the case. They can only hold Rickett for twenty-four hours, but are able to glean enough information during that time period to at least have a place to start. Cragen and Benson both worry that Stabler will let his hatred for the suspected child molester interfere with his ability to do his job.

After an 18-year-old girl is kidnapped, psychic Sebastian Ballentine comes forward claiming to have information on the killings. Stabler refuses to believe that Ballentine is a real psychic, and is convinced that the hints he is dropping about the case indicate he is somehow involved.

Benson saves April Troost from committing suicide, but feels responsible when Troost dies during the trial of the man she accuses of raping her and getting her pregnant. It isn't long before detectives learn that Barclay Pallister wasn't the only man April picked up in a bar who has no recollection of sleeping with her, and the squad realizes that Troost was no victim. Their search takes them from prospective parents looking to adopt her child to the men she drugged and accosted to the sperm center she used to work at, which ends up at the center of the case.

This crossover continues on Law & Order S16E02 Flaw (II).

After Carolyn Pereira's body is dumped in an area frequented by prostitutes, Stabler and Tutuola soon realise she had far more money than a student on financial aid should have had, and learn that she was deeply involved in the worlds of online gambling and high stakes poker. Suspects include the Gloria Culhane, the roommate who ended up with the very expensive ring that Caroline stole from a star athlete, Roddy Franklin, the star athlete who had his ring taken by Caroline, and Adam Halder, Caroline's best friend from childhood who turned out to be her backup during her online gambling forays. Stabler makes a special plea for Halder, feeling like he and the young man have something in common because both were boys from the wrong side of the tracks dealing with rich kids who treated them like dirt.

Ken Randall calls Benson for help after he's picked up in an alley late at night. He claims that he was looking for a body after overhearing a man talk about murdering a woman and dumping her body while he was at the bar that night. Tutuola is upset that no one informed him, and determined to clear his son's name even though Ken immediately gets his own lawyer. Tutuola turns his eye on Ken's cousin, Darius Parker, who was with Ken that night and has been in and out of trouble for years, and after Ken voluntarily submits his DNA to clear his name, a shocking family connection between Darius and Ken is revealed. Darius confesses to having murdered the woman and her baby, but his confession is out because no one had contacted his lawyer.

After Jamie Hoskins falsely accuses two classmates of rape after a consensual act then hits nine pedestrians during an attempted suicide, medical tests reveal she has been taking medication for bipolar disorder and stopped her pills a week earlier. Jamie is charged with murder and released on her own recognizance after she agrees to take her medication, but after rock star Derek Lord, who is well known for his negative views on psychiatry, gets involved and begins spearheading her defense, Jamie again stops taking her medication. Novak is sympathetic to Jamie, but Jamie's insistence on following Derek Lord's advice leaves Novak with no choice but to take the case to trial.

Stabler and Tutuola pair up to investigate when two teens go missing while their school is on a field trip to a local museum. Their investigation soon turns up evidence that the disappearance was staged to help Janey, who suffers from Turner's Syndrome, be with her older boyfriend, a man with a prediliction for young girls, and to help the boy, Connor, make good on a gambling debt. Stabler experiences a rift with his daughter, Kathleen, who is upset over the way that he has handled her relationship with a young man named Kevin.

After a mother and her ten-year-old daughter are found raped and butchered in their apartment, Stabler and Beck take in a homeless man who turns out to be Munch's uncle, Andrew. Initially he's their main suspect until they find their way to a new suspect. Unfortunately, when their only evidence against Brent Allen Banks is thrown out in court, Andrew, suffering from mental illness, goes too far trying to do what he is convinced is the right thing.

Stabler and Beck disagree on how to handle a case involving a rapist who seems to be escalating his attacks. Beck is getting too personally involved in the case and with the victims, which Stabler warns her against. The key witness in the case is a pregnant woman who denies having been raped more than once by the man, whose goal appears to have been to impregnate the women.

After Danielle Masoner dies in Central Park, Stabler follows the leads to a homeless man who turns out to be a better witness than he thought. Paired up again with Benson, Stabler investigates her death, but it keeps bringing up memories of Dani Beck for him. During the course of the investigation, Benson and Stabler learn that Danielle's husband was sleeping with a friend of theirs, leading the squad to suspect first him, but their suspicion soon turns to the husband of the other woman.

The only witness to a young woman's horrific beating is her mentally challenged daughter.

A woman's body is found murdered in a park alongside a man with a bullet in his head - Benson and Special Agent Cooper join forces and suspect "The Woodsman", a serial killer Cooper has tried to catch for years. Lake and Benson begin to question Cooper's true motives when the male victim is later identified as "The Woodsman".

After investment banker Jeremy Haynes is found dead, suspicions turns to his boyfriend Lincoln Haver, a professional football player who could lose everything if the truth of his sexuality became public. When news of Haver's sexual orientation comes out, Benson comes under fire for her relationship with a reporter.

The squad is left at ends when Lake is caught in a gunfight and later takes a witness hostage.

Teenage boy Eric Byers admits himself into the squad room, and warns the team about an unnatural desire towards his younger stepbrother, Cory Kelly. Detective Elliot Stabler and Olivia Benson’s suspicions arise, and Eric admits to also looking at a website to try to curb his pedophilic urge. With no crime committed, the detectives decide to investigate this “self-help” website for pedophiles leading them to it’s creator, Jake Berlin. Eric’s rage induced stepfather is also questioned, and shortly after Eric is found missing. The detectives must race to place the clues together to find and stop Eric before any crime is committed.

A turf war ensues when Stabler and Tutuola link an artist's murder to a serial killer, and the detective assigned to that case focuses more on their involvement in an investigation he believes belongs solely to him than on identifying the killer.

DNA links Olivia to the murder of a biker in Central Park whose gang specialized in hits and prostitution. With Munch and Fin assigned to the investigation and evidence continuing to mount against Benson, Elliot begins his own inquiry – determined to prove her innocence and save her career.

Detectives Olivia Benson and Eliot Stabler are called in to investigate when a disabled woman, Cara Benson, is beaten and raped. Though the victim's condition has rendered her unable to speak, the detectives soon deduce that someone close to her is responsible, with the lead suspects being her resentful sister and troubled nephew. As the investigation continues, Benson and Stabler strive to make Cara comfortable with coming forward to stand up for herself and illuminating some of the disturbing truths about the assisted living business.

When a pregnant woman is raped, Detectives Olivia Benson and Eliot Stabler arrive at the hospital to find that she has fled. Even when someone is arrested for a similar offense, ADA Jo Marlowe says she doesn't have a case in court unless they find the victim and get a statement from her. Soon, Benson and Stabler connect the woman to an illegal adoption operation, forcing them to go undercover and expose the truth.

Detective Saliyah "Sunny" Qadri goes in search of Brooklyn District Attorney Page Ferguson, who she fears may be in danger. Qadri finds Ferguson just in time to witness her fall from the top of a parking garage. When Benson arrives, she discovers that the crime scene has been tampered with. Benson turns to an old friend, Assistant U.S. Attorney Christine Danielson for help. As the investigation progresses, Benson begins to question Ferguson’s suspicious past and Qadri’s involvement in the case.

The TV host of a show that spotlights predators receives threats to her safety, and this reawakens her hunt for her sister's abductor. An ADA with connections to the TV host then assists detectives in their investigation.

When a young woman finds a teenage boy asleep and naked in her bedroom, his mother, Bree Walsh, is quick to defend him. While Detective Benson and Detective Stabler try to figure out what truly happened, they also have to manage the sneaky teenager and his naive mother. As the detectives dig deeper, they discover how deceptive appearances can be.