Rozat "Rusty" Sabich is a prosecutor and the right-hand man of district attorney Raymond Horgan. When his colleague Carolyn Polhemus is found raped and murdered in her apartment, Raymond insists that Rusty take charge of the investigation. With the election for District Attorney approaching, Tommy Molto, the acting head of the homicide division, has left to join the rival campaign of Nico Della Guardia. Rusty, a married man, faces a conflict of interest since he had a brief sexual affair with Carolyn. As he had shown little ambition and would have therefore been of little use in advancing her career, Carolyn abruptly dumped him. Rusty has since reconciled with his wife Barbara, but is still obsessed with Carolyn.