Et si une chanson pouvait rendre amoureux ?
Théodore, a strange and shy parisian man, discovers a song with supernatural power. An old jazz classic from the 1920s which will be make instantaneously make two people love each other. He has to find this song to seduce Amandine, the love of his life. His investigation leads him to New York City, where he meets a community of young jazzmen.