The investigation into the killing of an abortion clinic doctor leads to an activist group led by a former priest.

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).

McCoy's new second chair, ADA Jamie Ross, is determined to prosecute as harshly as possible a carjacker who took the life of a teacher as she pleaded for her life on an audio tape discovered at the crime scene.

After the cops trace an eagle tattoo on a man shot and killed while holding up an armored truck to a group of militia members, McCoy finds himself facing one of their number as the pro se counsel for his friends, arguing for the concept of "jury nullification", the right of a jury to protect a defendant from an unjust law by finding him not guilty despite the evidence.

Evidence points the detectives in the direction of a fascist youth gathering after the brutal beating and murder of a high school girl.

A wealthy woman, who is a patron of the arts, is found dead in her apartment and the ensuing investigation leads to a suspect whose violence was spurred by a painting similar to the crime scene.

The wife of an attorney with many disgruntled clients is killed but the detectives believe that he was the intended target as he was willing to reveal information despite confidentially agreements. As the investigation continues, his tumultuous love life is exposed and the prosecutors are suspicious of his desire to return to the courtroom.