A public health doctor, the wife of a retired attorney, who tracked HIV cases is found murdered and raped in Central Park. Her work involved contacting sexual partners of HIV patients which gives the detectives a long list of suspects and the detectives try to link threatening phone calls to the crime. The discovery of a second body in Central Park with the same signature shifts the focus to a possible serial killer.

After a young boy witnesses the brutal sexual assault and murder of his stepmother, he is too terrified to tell the detectives who attacked her.

A woman with a high-risk pregnancy disappears and her ex-boyfriend, who's the father, and engaged to the boss' daughter, is under suspicion. In a race against time to find her as her delivery date approaches, Benson and Stabler are faced with more than one suspect willing to take the fall for the crime.

The discovery of a beaten infant leads detectives on a search for the attacker, who may be a pedophile. When the medical evidence shows the injuries were a result of shaken baby syndrome, their focus shifts to those closest to the child: her mother, the mother's boyfriend and the nannies.

A young, emaciated boy is found by neighbors scrounging for food; detectives suspect the boy is a victim of abuse and are reluctant to let him go home.

As Benson and Stabler investigate the disappearance of a mother and her teenaged daughter, they uncover a conspiracy between a corrupt immigration attorney and gangsters running a prostitution ring that is staffed by women they have smuggled into the country and imprisoned as sex slaves.

Fin is reunited with his own son as he risks his life to save two small children, one caught in the middle of a bodega robbery and the other from the junkie who set the child's mother up for murder and then stole him to use as a front in her scheme to boost materials for her meth lab.

When a wealthy couple is found dead in their home, Benson and Stabler soon realise that their deaths are connected to a drug smuggling ring. Eventually the road leads back to the same drug dealers who forced a former assistant district attorney into hiding, and Alex Cabot comes home to face her enemies.

When the paternity of a missing young boy is placed into question, Stabler wonders if he really is the father of Kathy's child. Later, Stabler faces the possibility of losing not only his partner but also Kathy and the baby when she and Benson are in an accident.