Jesse Wallace, a successful author in his early thirties, is in Paris promoting his bestseller, "This Time". The book is based on his chance encounter with a Parisian woman named Celine nine years earlier. They spent a romantic day and evening together in Vienna before parting ways, promising to meet again in six months. When Jesse spots Celine at a bookstore appearance, they reconnect and spend the day together before his flight back to New York. As they reminisce about their past, they discuss their philosophies on life and love, now aware of how their day together has influenced their lives.

Before Sunset
Jesse and Celine embark on a sentimental journey in France, as their reunion nine years after their initial encounter takes an unexpected romantic turn, fueled by Jesse's book tour.