"Simon Pulse teen fiction"--Spine.

The party room. On Manhattan's Upper East Side. Everybody's fabulous. No one gets carded. Then someone dies. The Party Room is where the prep school crowd goes to drink up and hook up. The cocktails are chill and the bartender's hot. Everyone knows everyone -- except the guy that Samantha Byrne leaves with one night. The next day Sam's missing. Then she's found dead in Central Park, murdered brutally. It looks like a copycat killing of another girl who was murdered years earlier. By someone from Talcott Prep. The killer is one of them. He knows where they live. And where they play.