After going to the cinema with her best friend, a woman gets into her car and drives home – until a diversion takes her off her usual route. She misses exit after exit, straying further and further from home, where her husband is waiting for her. Within a night and a day, everything becomes clear: perhaps it would be better if she never went back to him. Because as unsettling as the darkness of the highways and gas stations may be, the true danger is waiting for her at home.