What a weird, weird book! 
This novel, part Sci-fi, part fantasy, part political fiction, tells the trial of a Sybil in 2062, judged for taking part in the collective amnesia decided shortly after a feminist party won the French presidential elections in 2017. 3 years of blank, no archives, no memories. Why such a decision? What has possibly happened in those 3 years to make 98% of the French population consider oblivion? 
In chapters alternating with a journalist commenting the trial, the Sybil tells us about her life, started 2913 years ago, and how the Party of the Circle came to existence, bringing to the forefront of French politics the voices of modern-day witches. 
This book is absolutely puzzling. It's told in reported speech, in theatre, in email exchanges, with the odd ad break here and there. It shows women (the author makes it clear we're talking about all women here, cis and trans) taking back power, but also how such a power escalates into chaos. I don't really know what to think about it, except that it's like nothing I've ever read.