Joséphine Arthus, a young journalist, is summoned to 36, quai des Orfèvres for reasons unknown to her.

Astrid Thompson finally succeeds in fulfilling her father's dream: to bring together four Stradivarius for a unique concert, eagerly expected by music lovers around the world. But Lise, George, Peter and Apolline, the four virtuosos recruited for the occasion, are incapable of playing together. The rehearsals are one ego crisis after another. With no solution in sight, Astrid decides to go and find the only person who, in her eyes, can still save the event: Charlie Beaumont, the composer of the score.