Before school lets out, Mrs. Tingle's class is going to need a substitute teacher.

A bright high-school senior has her impending status as valedictorian jeopardized when her bitter history teacher, Mrs. Tingle, gives her a poor grade on a project. When an attempt to get ahead in Mrs. Tingle's class goes awry, mayhem ensues and friendships, loyalties and trust are tested by the teacher's intricate mind-games.