What Nicholas (9) loves most is playing with his gang of middle school pals, The Invincibles. Adorable, yet mischievous, they have all sorts of adventures together and life could not be funnier. So when his dad gets promoted and announces that the family is relocating to the South of France, his world falls apart. Little Nicholas cannot live without his friends. But the pack has a plan to prevent this terrible relocation: a treasure hunt.

1900年的巴黎，妓院普萝奈像一座宫廷一样，成为寒夜里最温暖的地方。波莉娜·德埃（Iliana Zabeth 饰）刚十五岁半，写了封自荐信要求到妓院工作，声称希望“自由”；美丽的玛莲娜（Alice Barnole 饰）遇上一个肯给她蓝宝石的客人，她以为是爱情，却迎来把她割成笑面人的刀子；朱莉（Jasmine Trinca 饰）不幸染上梅毒，老相好只给她写来情意绵绵的信，放任她死亡，只有姐妹们哭泣……妓院里浮光掠影着百年前的种种，男人和贵族们的奇怪欲望，女人们被持续物化，虐恋和疾病永不止息，假面舞会要终结怎样的痛苦……