With the occasion all but overshadowed by her sister's upcoming wedding, angst-ridden Samantha faces her 16th birthday with typical adolescent dread. Samantha pines for studly older boy Jake, but worries that her chastity will be a turnoff for the popular senior. Meanwhile, she must constantly rebuff the affections of nerdy Ted, who is unfortunately the only boy in school who seems to take an interest in her.

Prom season at Shadyside High is underway and the school's wolfpack of It Girls is busy with its usual sweet and vicious campaigns for the crown. But when a gutsy outsider is unexpectedly nominated to the court, and the other girls start mysteriously disappearing, the class of '88 is suddenly in for one hell of a prom night.