The death of a show horse leads to a trial involving insurance fraud, a sting operation and a wealthy woman's disappearance.

McCoy finds that his career is on the line when his former female assistant and ex lover accuses him of forging evidence that helped put an innocent man in prison.

A subway station gas attack, similar to one that took place in a Baltimore church five years earlier, brings Baltimore detectives Tim Bayliss and Frank Pembleton to New York to assist Briscoe and Curtis.

This crossover continues on Homicide: Life on the Street S04E12 For God and Country (II).

Paul Robinette places the system on trial when he defends a young black woman accused of kidnapping her biological baby from his white, adoptive parents.

A jogger killed in Central Park turns out to be the second wife of a former comedy club owner, who was acquitted of killing his first wife. And convicting him this time may hinge on tracing the path of a Columbian coin used as a subway token slug.

A down-on-his-luck ad executive becomes the prime suspect when his wife and son are killed, and his daughter wounded on a night that he claims was spent drinking.

When a young attorney is murdered shortly after he decides to file a sexual harassment claim against his employer, Briscoe and Curtis quickly discover that the alleged harasser and his wife each have an excellent motive for murder.

The investigation into the murder of a model with a passion for cocaine and partying focuses on the men in her life -- a nightclub owner, a basketball player, a photographer and a limousine driver.

A woman is shot while sleeping, and the investigation leads the police to a boy whose crack-addicted mother has entrusted him to a dealer's care.

After a college co-ed's body is found, the detectives look for a campus rapist, but the medical examiner's report puts them on a different path, one involving prostitution.

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.

After an infant is found dead in his crib, it's determined he was poisoned, and all evidence points to the child's au pair.

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 cops tackle identifying a corpse left in an elevator, and McCoy finds his prosecution of the suspect later hampered by a vindictive judge who resents Ross's in-court rebuke for sexual harassment.

Briscoe and Curtis have to break the mutual alibi of two girlfriends as they try to find the killer of a young black man, whose angry parents pressure McCoy to indict a young woman who claims the victim had raped her.