Star at 17 years with the series of Sissi, Romy Schneider leaves Austria and glory for the love of Alain Delon. From Luchino Visconti to Otto Preminger, through Zulawski and Costa Gravas, she turned with the greatest. The directors interview those who knew her, who loved her, go back to the filming locations, make archive images speak for themselves... and try to detect the part of mystery that Romy Schneider conceals for ever.