The murder of two prostitutes leads to a violent rapist and murderer, Jon Becker. But unfortunately Benson and Stabler find Becker dead at the hands of his latest fling, Debra, convincingly innocent and claims to have acted to save herself. But when a CSU tech discovers that Beckers gun was used in a murder while he was in jail, Debra becomes a suspect. A credit card fraud search reveals her true identity Maggie Peterson and her link to a slew of unsolved homicides. They have themselves a serial killer who Huang exposes as a Chameleon, someone who can adapt to whoever they are dealing with. She impresses everyone when her presence, manipulates her behavior, with each detective that interrogates her. A legal debate, which includes L&O's Nora Lewin, ensues when Cabot goes for the death penalty.