There are five of them who receive the same letter and are linked by the past. The former members of an orchestra are summoned for a very special performance. They take out their instruments and embark on a very eventful journey, shaken in turn by the echoes of a chaotic and dark past. But, as we can say to ourselves to reassure ourselves: "don't worry". In this choral story, the authors' styles intertwine in a breathless tempo.