Fabienne is a star; a star of French cinema. She reigns amongst men who love and admire her. When she publishes her memoirs, her daughter Lumir returns from New York to Paris with her husband and young child. The reunion between mother and daughter will quickly turn to confrontation: truths will be told, accounts settled, loves and resentments confessed.
Five days before D-Day, the day of the last voyage of the Order of Sirius, a sect nestled in the Vaudoise Alps, Switzerland. Five days during which a community of 48 people, women, men, children, fed with esotericism and guided by a narcissistic guru, will test their faith and be deprived of their identity. Five days in which every gesture will be the last. Sirius is inspired by the massacre of the Order of the Solar Temple in 1994 in western Switzerland.