A subway-station bombing prompts the squad to seek help from detectives in Baltimore where their prime suspect is wanted.
When New York City experiences a major blackout, Frank uncovers some unpleasant truths about his department in the aftermath.
A woman is found dead of a head wound with no clues to her identity other than her mass-transit pass.
Opponents of Adam Schiff question the handling of a sexual-assault case by the police and the D.A.'s office.
Sipowicz learns his son's older fiancee has been unfaithful; a homeless man is suspected in a 9-year-old's murder.