S4, E25: When an alleged rape victim is kidnapped from a New York hospital and later murdered, Detectives Benson (Marishka Hargitay) and Stabler (Christopher Meloni) search for the girl's killer only to discover her attack to have been perpetrated by several bored young socialite club goers at a popular Manhattan nightspot. Relying on DNA evidence, the detectives uncover multiple suspects, including one supposedly despondent teenager whose involvement in the assault continues to evolve.