When a college girl is found beheaded at a sorority party, the entire team focuses on their toughest case yet. The victims wear t-shirts emblazoned with a logo inspired by Greek mythology that offers clues and hidden messages. By tracking the codes on the web, the team discovers that a serial killer is replicating the fate of mythological creatures by killing people in the same manner, and the only way to stop him is to unravel the hidden codes before he strikes again.