When teacher Randall Thomasson is killed during a carjacking, an unexpected visitor shows up at his funeral - his estranged brother, Karl Thomasson. An ex-Green Beret turned mercenary, Karl signs on as a new substitute teacher in order to investigate Randall's murder.

At a college visit to a war buddy's professor daughter, mercenary Treat Williams finds her brutally beaten. He then poses as a teacher to teach a lesson to the football jocks responsible.