When seventeen year-old Andrea McWilliams is found strangled and beaten to death in an alley, her ex-boyfriend leads the cops to a website that McWilliams used to meet up with random men . Detective Olivia Benson (Mariska Hargitay) decides to create a user account for the site and finds womanizer Peter Butler (guest star Brian Geraghty), the man who met up with McWilliams. The case is closed when a different suspect is proven guilty of her murder, and a new one opens when McWilliams rape kit tests positive for HIV. Not only is HIV spreading as a result of countless attacks, but now the detectives must also catch a rapist on the loose

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