Two friends, Jeanne and Johanna, are members of a rinky-dink orchestra, ''Les Sirènes'', playing the Decazeville region in everything from ballrooms to beauty pageants. While Jeanne is introverted and romantic, Johanna is outgoing and sensual. A talent competition in Toulouse catapults them to success thanks to a sound engineer's ruse: Johanna mimes on stage to a play-back of Jeanne's voice. The crowd go wild, a star is born. Johanna has it all: great presence, great voice. Gigs follow, and their ill-shared success proves devastating for our two heroines, who learn that in a society where appearances are all, there is one thing that cannot be bought: their friendship.