In New York City, when a crime is committed, the victims are represented by two distinctly separate yet forever intertwined groups of people. There's the police department, represented here by the 27th precinct homicide detectives. It is their job to investigate the crime, collect evidence, interview witnesses and then, when the evidence points to a suspect or suspects, they will place them under arrest. The matter is then taken over by the prosecutors of the Manhatten District Attorney's office, who discuss deals and plea bargains, prepare the witnesses and evidence all whilst conducting the people's case in the trial of the accused. Both teams work together as well as with the Medical Examiners Office, Crime Lab and Police and District Attorney psychologists or psychiatrists.