Heroic bookseller Laurent Letellier comes across an abandoned handbag on a Parisian street. There’s nothing in the bag to indicate who it belongs to, although there’s all sorts of other things in it. Laurent feels a strong impulse to find the owner and tries to puzzle together who she might be from the contents of the bag. Especially a red notebook with her jottings, which really makes him want to meet her. 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?