Hakim and Latifa fled the Algerian civil war in the early 90s. They live since in the Jura, with their two daughters: Nedjma 14 years, and Leila, the eldest, left to study hair in Paris. Three days before Christmas, Nedjma receives a terse SMS from her older sister. She will not be able to come to join them for the holidays, pretexting once more an overload of work - Latifa attacks Hakim and pushes him to fetch Leïla. Nedjma will come with him, they will take the opportunity to discover Paris. Upon their arrival in the hair salon, they learn that Leila has actually never worked. It is the journey of a father who begins in Paris one night until dawn.

Paul Château-Têtard, a 45-year-old bachelor from the best of Parisian nobility, has – for the first time in his life – to take the Metro, and even buy a ticket. It is with extraordinary luck that the beautiful young Ava happens to be sitting at the counter: a spark ignites and wedding bells begin ringing in the distance.

Valentin is a young gay painter who lives in the imaginary world of his paintings. When he finds his grandmother Nina, a Polish Jewish émigré whith whom he feels very close, he confesses his lack of inspiration and loneliness. During these few days together in a psychedelic Paris, Valentin expresses more and more the need to know the past Nina always tried to hide …