Dusoleil, a shy and unpretentious civil servant, works in a monotonous office and follows a very normal life, almost "invisible". To pass the time, he writes letters to his mother and dreams of the beautiful Isabelle. Isabelle is locked up by her husband, the Attorney General.
Dusoleil discovers one day that he can now cross walls. He then begins to steal from the rich and give to the poor. He also gains the self-confidence necessary to seduce Isabelle. She is intrigued by the reports on Passepartout, a mysterious criminal who can walk through walls.
When Dusoleil admits to being Passepartout, he is tried before the prosecutor. Before the trial progresses, Isabelle reveals her husband's secret that he was a Nazi collaborator. Dusoleil is pardoned and spends a romantic night with Isabelle. When he takes the pills prescribed by the doctor, mistaking them for aspirin, he loses his magical power. He finds himself stuck halfway in a wall and his memory lives on in stories and songs.
Check out the song Somebody, performed by Lucy O'Bourne who will be Isabelle on the show's UK tour: