A count of the corpses in storage at a police training facility leads to a murder investigation.
Firefighters find a mass grave in the cellar of a home with nine bodies, one of which is directly connected to a cold case. Christine has trouble fitting in when she takes over for Bernice, who didn't leave her any instructions. Mickey comes under suspicion when Bailey's wife is murdered because he pointed the finger at her.
The squad re-investigates the murder of a well-known philanthropist at the request of the son who is believed to have murdered him. Nicco helps Mickey when she's suspected of murdering Bailey Gallanson's wife.
A count of the corpses in storage at a police training facility leads to a murder investigation.