1967, Mardi Gras. Françoise is a seventeen-year-old boarder in an all-girls Catholic high school. Convinced that she has only one night left before her death, she sneaks out with her friend Delphine to attend a costume party and live the night as if it was her last.

Joseph and his two sons, Joachim and Ivan, form a close-knit family but fail to see that each one is losing control of his life. Joachim is supposed to be studying psychiatry but spends most of his time daydreaming about his ex-girlfriend, Ivan cannot fit in at school despite being very smart, and Joseph has secretly quit his job as a doctor and is trying to become a writer. While there is plenty of affection at home, all three are also, clumsily, searching for love...

In the backdrop of the Nazi occupation of France, taken to the hospital for a broken leg from an accident, twelve-year-old Maurice Gutman is narrowly spared from the mass roundup that will take his family from him and leave them imprisoned in a distant death camp. At the hospital, Dr. Daviel diagnoses him with tuberculosis and imposes a long treatment, perhaps a humane ruse to prevent him from being deported. Over the course of two years, while living with the hospital staff, Maurice and eight other young boarders unforgettably experience friendship, solidarity and extraordinary courage. These are the children of luck.