While cleaning his boss's office, he intercepts an official invitation from the prestigious Théâtre du Châtelet in Paris to replace a concert of the Los Angeles Philharmonic Orchestra that was canceled at the last minute.

But La Rivière convinces her to come to the theater because the Concert holds the key to Anne-Marie's past and her parents, whom she has never met, and whom she believes to be scientists who died during her infancy in the Alps.

Guylène, at the time the representative of a visiting French orchestra, had managed to escape with Baby Anne-Marie hidden in a cello case, at the behest of Irina, Filipov, and Sasha.

In the meantime, the real manager of the Bolshoi, who happened to be vacationing in Paris and learned by chance about the concert, appears at the theatre to prevent the performance, but he is intercepted by Gavrilov, who locks him in a broom closet.

The concert has a wobbly beginning due to the lack of rehearsals – even Gavrilov, who actually intended to speak at a Communist Party meeting, asks God to demonstrate his existence by salvaging the situation.

However, the orchestra manages to reach Filipov's ideal of spontaneous harmony once Anne-Marie mesmerizes everyone with her magnificent interpretation of the solo part, which she had studied on her mother's annotated score.