Alysandra is celebrating: Keona, the queen's daughter, is back among hers. In the basements of the thirteenth district, it is another liberation that is celebrated: that of the fearsome Alissa. Her uncle Djen, who took the head of the Sistre clan, is about to hand over to her the keys of a clandestine kingdom... which will suddenly be shaken by an event as unexpected as it was brutal.