Louis spends the week at his father's place. His father, a musician, spends all day practicing a difficult piece, paying little attention to his son. Louis gest bored and annoys his father, who eventually takes him to the park down the street. Louis is amazed by eberything he sees at the park. His father, tired, falls asleep on a bench. When he wakes up, Louis has disappeared. This begins a strange game of hide-and-seek, filled with music, in a park overtaken by Louis's imagination.