When Randall Thomasson, a concerned teacher, is gunned down during a car-jacking, an unexpected visitor shows up at his funeral: his estranged brother, Carl Thomasson (Treat Williams). An ex-Green Berret turned mercenary, Carl has just signed on as new substitute teacher in order to investigate Randall's murder. With his military training, he easily dispenses with knife-wielding students and thugs in the men's room. But when he traces the bullet that killed his brother back to someone within school walls, Carl is forced to break out the big guns.