Marie and Lucie are two twin sisters with diametrically opposite characters. They hate and adore each other at the same time . Lucie plays the outgoing pinup outgoing and like what shines, while Marie, a lot more reserved, is a model of austerity. One day, Lucie has the possibility to record a disk. Her friend Nicolas recalls her that she doesn't know how to sing. However, Marie possesses a pretty voice. The later arrives in Paris for a concert and go up on stage instead her sister. When Marie and Nicolas come back at Lucie's, they realize that she commited suicide. Marie's reaction is immediate: she decides to make herself pass for her sister. Seized by Lucie's life she slowly discover her hidden face.