A young girl is killed on her way home from school and when her mother kills the murder suspect, the District Attorney's office looks into her connection to the crime.
A rich NYU student who was into the biker scene, and offered a large sum of cash by his father to get out of it, is found murdered and Briscoe and Curtis have to come together as partners in order to solve the case.
The murderer of an undercover officer may face the death penalty and it's Schiff's decision.
The humiliated wife of a doctor murders the hooker her husband was sleeping with.
A Jewish art teacher is murdered in her classroom and though initial suspicion falls on another teacher, the investigation undercovers a deep running anti-Semitism at the school.
A murder case closed thirty years ago is reopened when new evidence suggests that the man convicted didn't commit the crime.
Detectives from both New York and Baltimore join forces to stop a person setting off gas bombs in both cities, but find their relations strained because of differing investigation strategies.
A man formerly acquitted of murder (his first wife) comes under the microscope when his second wife is killed while out jogging. A witness clears him of being directly involved, but the detectives find clues that may link him to the murder.
A family is murdered in their home leaving only a wounded daughter as a survivor and the father who said he was out drinking as the prime suspect. Missing jewelry ties the surviving daughter's boyfriend to the murder and it's revealed that the daughter hired her boyfriend to kill her mother.
The death of an elderly woman is linked to a drug dealer and the drug dealer's use of a boy sold to the dealer by his user mother.