A stranger enters into and forever alters the life of a couple. He claims to be pursued by certain authorities who intend to prevent him from disclosing a secret that only he holds, whence the title. Is he lying, or insane – or is he telling the truth? Who, if anyone, is after him? And what *is* – the secret?
Stars
Jean-Louis Trintignant
Marlène Jobert
Philippe Noiret
Jean-François Adam
Solange Pradel
Antoine Saint-John
Michel Delahaye
Maurice Vallier
Robert Enrico
