Bookseller Laurent Letellier comes across an abandoned handbag on a Parisian street, and feels impelled to return it to its owner. The bag contains no money, phone or contact information. But it does hold a small red notebook, full of handwritten thoughts and jottings that reveal someone Laurent would very much like to meet. Without even a name to go on, and only a few of her possessions to help him, how is he to find one woman in a city of millions?