When a popular student and star pupil at Manhattan's most elite private school is murdered inside the school, the CSI's find themselves immersed in the highly competitive world of over-privileged youth. The CSI team investigates the death of the senior class valedictorian who was also the most popular girl at an elite private school on the Upper East Side. Just as the investigation appears to hit a dead end, Mac notices that an empty water bottle which was found among the victim's belongings is actually an elaborate cheat sheet. Did our victim die because she confronted a cheater? Or would she do anything to maintain her grades and busy schedule?