Mélusine Mayance born 21 March 1999 in Paris is a French actress She is best known for her role in the 2010 FrenchLanguage film Sarahs Key in which she portrayed the childhood version of the storys main character Sarah Starzynski whose life story is uncovered and told by Kristin Scott Thomass character many decades after the end of the second world war Known in French as Elle sappelait Sarah the historical fiction film is set in 1942 France in the midst of the second world war Mélusines character is a young Jewish child whose family is rounded up and arrested in downtown Paris during the Vel dHiv Roundup before being sent to Auschwitz for extermination Mayance rose to success while starring in films such as Vive Les Vacances and Ricky in which she plays the halfsister of an infant boy who grows a pair of wings