A serial killer travels through time on a crime spree sans consequence.
Romane and Clemence are between 25 and 30 years old, they are sisters and live together. Romane has to look after Clémence, who is disabled since they had a car accident, when teenagers. Romane was not hurt, but Clemence had a cerebral vascular accident which lets her completely unable to speak and to walk in a normal way. One night, while Clemence is asleep, Romane decides to go out. That night, she will get back home late with Guillaume, her new boyfriend. Day after day, Guillaume will gradually feel invested in a duty: make Clemence recover her speech and the use of her legs. But over the days, the complicity between Clemence and Guillaume will become more and more unbearable for Romane.