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?
Length 102 minutes
Jean-Louis Trintignant | Marlène Jobert | Philippe Noiret | Solange Pradel | Antoine Saint-John | Michel Delahaye | Maurice Vallier | Frédéric Santaya | Jean-Claude Fal | Patrice Melennec | Pierre Danny | Jean-François Adam