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.

Audrey attempts to stop her brother from marrying a young French woman during their rescheduled wedding weekend in the Hamptons, which happens to be the same weekend she turns 40.