Raphael, a mandolin player at a restaurant who walks with a limp, is burdened with supporting his family and managing significant debt. He takes on a job from his friend Giardino, which involves performing a serenade beneath an apartment window for an enigmatic blonde woman. During his performance, a man is suddenly shoved from a high balcony, falling to his death. Driven to uncover the truth, Raphael embarks on his own investigation, finding himself entangled in a mystery that hides a dark secret…