A few years after the Charlie Hebdo attack, teacher Samuel Paty leads a classroom discussion on free speech in a suburban Paris school. A lie, carried by outrage and amplified online, sets off a chain reaction no one can control. As tensions escalate and silence spreads, an ordinary lesson turns into a fatal spiral. In the aftermath, voices collide to confront a devastating truth: how a rumor, a click, and collective inaction can lead to the irreparable.