Constance works for an independent radio station where she broadcasts sound creations of political character. She lives with Eugene, an aspiring writer, voluntarily withdraws from the outside world. Each week, the couple welcomes Beatrice, a lonesome and tragically-minded homeless young woman, in their modest apartment. Destiny makes Constance and Beatrice stumble upon Raoul Debord, a mystery-man at the head of a clandestine revolutionary organisation, whose upcoming mission is to hijack all the city’s radio waves.