One night in Paris, Anna, a teenager from Clermont-Ferrand, misses the last train home. Penniless and without a phone card, the lost girl finds herself alone in the empty station. After a while she meets a man walking his dog and asks him to help her. Reluctant at first, Felix ends up taking her to his apartment where she will be able to call her parents. There, in the company of Félix and Jacques, his dog, a strange night begins...