Marion is a French-born photographer living in New York City with her Neurosis, hypochondriacal, chain-smoking, heavily tattooed American interior designer boyfriend Jack. After a markedly unromantic trip to Venice, which was planned to re-ignite the passion in their relationship, they take a night train to Paris to pick up Marion's cat from her parents and decide to stay for two days. Jack is startled to learn Marion has remained in contact with numerous ex-lovers and becomes increasingly uncomfortable due to the language barrier and a multitude of her old flames she keeps meeting. Meanwhile, Marion wrestles with her own insecurities about love, relationships, and her impulsive nature.