Sipowicz returns to active duty, but perhaps a bit too soon as his system hasn't quite adjusted and he has an accident when later interrogating a suspect. He begins to work a case with Russell and Simone, investigating the murder of a woman's boyfriend by her ex-husband. Before the investigation gets going, Simone is called upon by Det. Savino to help investigate a missing persons report that is being filed by the nephew of one his building's tenants. The missing woman had run-ins in the past with Simone's partner and building manager, Henry Coffield, so he is suspected and the other tenants support that theory. Interrogation of the ex-husband reveals that he was searching for his daughter who's missing. Despite an agreement keeping her immune from prosecution, the detectives' work to find another means to prove the crack addict mother and her dead boyfriend were responsible for the girl's disappearance. Meanwhile, former PAA Naomi Reynolds stops by hoping to see Bobby and tell him tha