A quiet street in Paris, one summer morning. Pier, a strange kind of man, steps out of La Santé prison after five years inside, during which time he refused all contact with his past. He sleeps for a day, then spends his first night of freedom roaming the streets of Paris alone. Finally, he decides to read the letters his friend Sylvana sent him. They reveal past events that affect where he goes, whom he meets and what he feels. Each one is an instigation to follow his movements and discover with him, via his strange gaze, the characters, neighborhoods, lights and sounds of the city by night.