It is the work of the super-it-girl Caroline de Magrait and a troop of 3 of her friends, all of them members of the French elite. They are somewhere between being hipsters and sophisticates. Although the book is fun and amusing it has a certain sense of pretension that I can't stand.
Its strengths are its sense of humor and irony and the photos. There is also some good advice about how to avoid ostentation or to give the impression that you have done it all effortlessly in order to achieve that "unkempt chic" look. Its weaknesses are some of the topics and the contradictions I found that made me believe it was more about posturing with little substance.