A few years after meeting on a train in Europe and spending a memorable night together in Vienna, fate brings Jesse (Ethan Hawke) and Celine (Julie Delpy) together again. Just like in 'Before Sunrise' (1995), the couple has only a few hours to spend together. This time around, they stroll about the streets of Paris. They do so while reflecting on their first encounter and discussing how things could have been if they had kept in touch. They cover many topics in their discussions ranging from the light-hearted to the deep and serious. Love, romance, relationships, marriage, fate and happiness are some of the topics they come to talk about.