For the high schoolers of Greenhaven, Cass Rockham's fall party is the social event of the year. Each October, students wait by theirmailboxes, praying for the gilt-edged invitation that grants entry into theinner circle of the most popular crowd. And now Cass has planned her finestparty yet, with a new sauna, a hot band, and no parents for miles. But to make this party really killer, Cass tops it all off with a sinister twist.

Nerdy Sarah Drew is shocked when she and her friends receive invitations to Cass's affair. For years she's steered clear of the popular kids, and now they want her to come to their party? Sarah is wary, but her friends talk her into coming with them. But she regrets it quickly, for at Cass Rockham's mansion, the only party favor is death.