In Paris, a young girl is found dead in a Parisian square, wearing an evening dress. Commissioner Maigret will try to identify her and then understand what happened to the victim.

A 1950s London cleaning lady falls in love with an haute couture dress by Christian Dior and decides to gamble everything for the sake of this folly.

Jeanne left Luc, at least for three weeks. But Jeanne is still very much here: in the coffee foam, on the opposite pavement or in a matchbox. Slumped at the bar, Luc is moping around. He is waiting to see her again or to forget her. A pile of scratch cards, a call made by no one and a strange psychic are so many reminders for his chagrin. Only three weeks left, minus one day… Well, not even one day, minus a few hours…

Victor, a disillusioned 60-something whose marriage is on the rocks, opts to relive the week of his life when, 40 years earlier, he met his true love through a company that allows customers to return to the time period of their choosing.