The piece is set in the boudoir of a star of café-concert, Bagatelle. Her maid Finette is having an affair with a clarinetist reduced to playing in the Cirque Fernando band, Pistache. After a performance, Bagatelle is rehearsing a peasant song when an 18 year-old young admirer enters through the window. He is Georges de Planteville and to ensure they stay together he throws the keys through the window. However Pistache had been hidden in the apartment also; in the morning Finette has to release all three. It emerges that Georges had defended Bagatelle during her show against detractors, so she returns his love.