Benson is called in after a young woman shows up at the hospital, raped and beaten with her head shaved. Haley Kerns refuses to submit to a rape kit, but Benson steals her underwear before leaving the apartment and gives it to Warner to check out. When Benson returns to her apartment she encounters Star Morrison, who admits that Haley is a federal informant working with them on eco-terrorism. After Stabler is wounded while out on a search with Morrison, Benson and she work to get information from Haley before the eco-terrorists can strike.

Stabler and Tutuola pair up to investigate when two teens go missing while their school is on a field trip to a local museum. Their investigation soon turns up evidence that the disappearance was staged to help Janey, who suffers from Turner's Syndrome, be with her older boyfriend, a man with a prediliction for young girls, and to help the boy, Connor, make good on a gambling debt. Stabler experiences a rift with his daughter, Kathleen, who is upset over the way that he has handled her relationship with a young man named Kevin.

Stabler and his new partner, Dani Beck, investigate the rape of a young woman named Nikki, who soon identifies a prominent lawyer, Martin Trenway, as her rapist. The squad has difficulty making the charges stick until another victim comes forward, but her testimony cannot be proven reliable. Determined to get at Trenway, Beck tracks down a woman from his past who holds the key to convicting Trenway, if they can convince her to expose the truth.

After a mother and her ten-year-old daughter are found raped and butchered in their apartment, Stabler and Beck take in a homeless man who turns out to be Munch's uncle, Andrew. Initially he's their main suspect until they find their way to a new suspect. Unfortunately, when their only evidence against Brent Allen Banks is thrown out in court, Andrew, suffering from mental illness, goes too far trying to do what he is convinced is the right thing.

Stabler and Beck disagree on how to handle a case involving a rapist who seems to be escalating his attacks. Beck is getting too personally involved in the case and with the victims, which Stabler warns her against. The key witness in the case is a pregnant woman who denies having been raped more than once by the man, whose goal appears to have been to impregnate the women.

Novak tries to find Benson when the case for a previous rape victim, Chelsea Arndale, hinges on her testimony. Benson, meanwhile, is still living as Persephone James and has been arrested in Oregon after the ecologist's group she has infiltrated is involved in a fracas with the local police. After the local sheriff advises her that her group is being looked at in connection with a recent murder, Benson decides to do a little investigating on her own and learns that the man was a pedophile. When she finally finds his private hideaway, it leads to a shocking conclusion.

After a third young teen is found dead, a paw print tattoo on her lower back, Stabler and Beck investigate the tattoo, which leads them to Broder House, a foster home for young girls. They learn that Chantal was one of a number of girls who had ended up working the streets for a man named Victor. Stabler warns Beck that she can't get emotionally involved in every case, but the two work together to bring down Victor, relying on one of his girls to get the evidence that they need.

After a van containing two young children ends up in the river, Beck finds herself drawn to the young girl, Eden, and the investigation into a tape found in the vehicle turns up a mysterious death involving a controversial attachment therapy technique. Beck tries to do the right thing by saving Eden, only to find herself torn when it seems as though there is nothing she can do to help. The investigation into the rebirthing turns up a foster family who abuses the children in their care, but not all of the children agree that it was abuse.