At a time when faith in politics has eroded and religion no longer provides answers, Mathieu Vasseur, known as “Matt”, has become the most followed personal development coach in France. On stage, he offers clarity, empowerment and catharsis, orchestrating seminars that electrify crowds and promise transformation. Behind the carefully crafted image, however, lies a far more troubling reality. As Matt’s influence grows, so do the mechanisms of control that bind his followers to him. Emotional dependence replaces self-discovery, and persuasion quietly turns into psychological domination. What begins as a collective quest for meaning gradually reveals the darker side of a system built on power, fascination, and submission. Director Yann Gozlan and César Award-winning actor Pierre Niney once again join forces in a gripping story of success, power, and greed. After the films A Perfect Man and Black Box, Niney’s charismatic protagonist returns once more as “Mathieu Vasseur.”