The protagonist of the French dramatic thriller "Stalk" is a talented engineering student named Lucas. The eighteen-year-old genius manages to get into the best university in the world, but his peers - children of wealthy parents - are not impressed by him. They mock him and use him for their own purposes. After a particularly hurtful prank, he decides to seek revenge in the only way available to a "nerd." He hacks into his classmates' phones and starts manipulating them using their unsightly secrets.