On the morning of her 17th birthday, high-school senior Liz Purr, the most popular girl in Reagan High, is kidnapped in her bed by three masked assailants, one of whom stuffs a jawbreaker into her mouth as a gag before she is placed in the trunk of a car. The kidnappers turn out to be Liz's "friends"—Courtney, Marcie, and Julie—playing a cruel prank on her for her birthday, which they do annually. When the girls drive up to a diner to treat Liz to breakfast, they open the trunk and discover she is dead, having choked to death on the jawbreaker Courtney had used to gag her.