A murderer's shooting spree in Central Park prompts Briscoe and his new partner, Detective Ed Green, to trace the murder weapon's origin; McCoy makes it his mission to punish the killer and the gun manufacturer.

As Briscoe and Green investigate the shooting of a judge, suspicion quickly points to her husband as the person who ordered the hit, but McCoy's case is hindered when she refuses to implicate her husband during the trial.