Bryan, the son of the Galesburg, Illinois mayor, is brutally murdered in his home, his body later found stuffed and posed as a scarecrow. Local policeman John Brady begins investigating the murder. Meanwhile, John's son Pete, a high school senior, sits in on a course at Galesburg University with his friend, Oliver. During the course, professor Gwen Parkinson screens a lecture by her late mentor, Dr. Le Sange, whom Pete's late mother, Catherine, once worked for. After the lecture, Pete agrees to become one of Gwen's test subjects in order to earn money for his college applications. Later, Pete attends a house party. During the party, one of his classmates, Waldo, is stabbed to death outside by a masked assailant, and Waldo's girlfriend Lucy is attacked and falls into the swimming pool. Pete and several others rush to save her, and the masked attacker flees; in the distance, he removes his mask, revealing himself to be Oliver. John subsequently questions Oliver, who says he cannot recall the events of the party as he was drunk.