Invitation, The (Point Horror) by Diane Hoh - Vintage Paperback

It arrives on crisp, ivory paper, printed with elegant gold script. Sarah has been invited to the social event of the year: Cass Rockham's annual Fall Party. But Sarah knows she isn't popular or rich enough to be in Cass' circle. She's just a nobody. A loser.

So why was she invited? Sarah hopes this will be a night she'll never forget. And it is...for unspeakable reasons...