Three high school girls named Heather run an iron clad social clique at high school. One of their anointees, Veronica, isn't sure she wants to fit into the clique, particularly when she has to snub some of her old friends at the Heathers' behest. When Veronica meets the new guy at school, she starts pulling away from the clique, while some of the more popular students start showing up dead with suicide notes.