It's Only the End of the World: Louis, 34, visits his family for the first time in years. He finds his brother Antoine, his sister Suzanne, his mother and his sister-in-law Catherine. Louis did not come back by chance. He wants to tell his family terrible news: his imminent and inexorable death. But as soon as he arrived, his presence brought back memories and old family quarrels. Buried bitterness and annealed tensions resurface one after the other and transform the little suburban pavilion into a stifling family prison. So much so that the unfortunate Louis never finds the right time to share his heavy secret ...