本片根据30年代真实事件改编，讲一个少女如何从父母的掌上明珠演变成杀害父母的凶手。维奥莱特似乎是天生坏女孩，偷钱、撒谎、卖淫，最后为了继承遗产，居然给父母下毒，结果把父亲给毒死了。

Faustine, a romantic teenager, decides to spend her summer in the countryside with her grandparents. Upon her arrival she briefly meets a teenager named Joachim and quickly becomes obsessed with his family, spying on them from a distance.
Eventually she begins to integrate herself in to their lives, befriending Joachim's cousins, flirting with Joachim himself and developing a crush on his uncle.