17岁迷茫少女为逃避痛苦的现实，加入了一个依靠特殊神秘药物进行集体“清醒梦”的青少年团体。这群年轻人通过药物在共享的梦境中肆意狂欢，但随着用药加深，梦境与现实的边界彻底崩塌，一个隐藏在潜意识深处的恐怖黑影开始入侵现实，对他们展开无情的真实猎杀。

Alice and Louis are brother and sister. She is an actress; he was a teacher and poet. For more than 20 years, Alice has hated her brother. In all this time they haven’t seen one another. The death of their parents brings the siblings face to face.

A seemingly ordinary day in the life of Quentin, a Parisian film-lover. After going to the cinema twice, he runs into a former college friend, listens to a girls' conversation in a bar, then goes and meet his best friend, has a beer, and ends up spending the evening in the Parc Montsouris, where he meets Lise.