Maggie Fitzgerald, a poor thirty-one year old waitress from the very lower classes and with a dysfunctional loser family, decides to make a difference through boxing. She convinces the experienced hardened boxing trainer Frankie Dunn to coach her and be her manager, with the support of his old partner Eddie Scrap-Iron Dupris, who sees her potential as a boxer. Frankie has a problematical relationship with his daughter, and practically adopts Maggie along her career.
A clique of popular girls, all named “”Heather,”” reign supreme at Westerberg High. Veronica is part of their group, but she begins to feel bad about the cruel, unfair treatment the girls impose on “”unpopular”” kids at school. When she meets a James Dean-type newcomer, J.D., she tells him her woes and he suggests they kill off the popular kids, make their deaths look like suicides, and end the tyranny. Veronica thinks he’s kidding, but one by one he eliminates these students, who ironically become even more popular once they’re dead. After staging a fake suicide, Veronica goes undercover to stop J.D., who’s gone over the edge with his plan to blow-up the school, making it look like a mass suicide pact.