S12, E7: After a young woman has been raped and murdered, her body turns up in an industrial laundry facility. Detectives Benson (Mariska Hargitay) and Stabler (Christopher Meloni) soon find that she was involved in an environmental group called CLEAN, and it isn’t long before they track down the prime suspect. However, the case soon puts them in the line of fire and exposes a much larger mystery that includes even more victims. As the investigation progresses, Detective Benson builds a connection to a victim’s daughter (guest star Maria Bello) that invokes her own past in ways she never anticipated. Alex Kingston guest stars. Also starring: Richard Belzer, BD Wong, Tamara Tunie and Dann Florek.