The temperature is rising. Andy receives a death threat. A prostitute is murdered, causing IA to look at John. A huge drugs and cash hoard is found. An elderly woman is found tied up and beaten.
A bomb threat is received at the courthouse. John Clark is placed on restricted duties pending charges for murder of the prostitute. John Irvin buys a new car only to be carjacked on the first drive.
A little girl disappears at the park, after her father leaves her - or so he thinks - in the care of a friend's nanny for a moment. Connie's brother-in-law is arrested.
Connie struggles to settle with the baby. A woman is found dead in a vacant lot. Another is found dead in the laundry room of her building. The Lieutenant dresses up for a lunch.
When NYPD Auxiliary Police Officer Heather Peterson is murdered, the detectives find a diary of her's that details the sexual habits of the police officers at the 15th precinct. These findings cause the detectives to suspect the officers of the 15th precinct had something to do with her death, and the investigation of the cops cause tension between the officers and the detectives.
IAB start interviewing the officers who were in the diary, and Sipowicz and Clark are blamed as rats. A social worker appears to have taken her own life. A former cop wants his ashes buried at the precinct.
Andy and Theo move out. Tony thinks about calling it a day with his ex-wife. Sipowicz and Clark Jr look into the threats made to Clark Sr. A distressed, schizophrenic young man keeps saying "she can't breathe".
Connie and Rita find young children home alone, living in squalor. Tony's ex-wife is found dead. A carjacker is killed, and cocaine is found in the car.