Sylvie de la Roche, the daughter of a destitute former nobleman, possesses a magnificent singing voice. Under the guidance of the irascible but talented musician, Maître Beaujeu, she prepares for her debut with the great tenor, Lablanche. Overnight, she becomes the toast of Parisian society, attracting the attention of a mysterious young nobleman and his companion. However, on the eve of her greatest triumph, Sylvie loses her voice. As she struggles to understand why and how to restore it, she must also navigate the complex web of love, betrayal, and intrigue that surrounds her.