Halfway through his senior year, Biff is still trying to work up the nerve to ask out Tommie, the girl he's had a frenzied crush on for the last twenty-three months. Then he meets Heidi: a smart-mouthed, cigarette-smoking fifteen-year-old with an attitude. Biff has never had such a good time with someone, even if he can't figure Heidi out. Is she brilliant or an airhead or just a liar? And what about Tommie?