Deneuve steals the movie as central character Marianne, a juicy part of recovering alcoholic that allows her to act randomly, both as a shrewd business woman and as an irrational, weak creature.
In her youth, Marianne had a love affair and a business relationship with jewels thief Battistelli, who dumped her into the hands of a victim twenty years previously. Being a fast operator, Marianne married Vincent, the victim, who was also a famous Paris jeweller.
Her new life of luxury drove Marianne crazy with boredom and depression - obviously, being rich is such a bore - and finally to alcoholism. Fast forward and Vincent's business is on the brink of bankruptcy, therefore he steals five huge diamonds and commits suicide, like everybody in his position would.
Marianne wakes up from her stupor and decides to sell the diamonds herself. Unfortunately, the diamonds owners are already on her tracks and convince her to frame ex-flame Battistelli, because he's damaging their business. But - guess what? - Marianne still has feeling for Battistelli...
To this mix are added two extra roles: Seigner as an eye-candy, younger version of Marianne and Bacri as a definitely not eye-candy, destined to be the third man who will support Marianne.
Could have been a decent tale, but it is told at a glacial pace, with bizarre scenes (Marianne on the train playing cards), and without ever gaining momentum.