La Clé sur la porte (meaning "The Key is in the door") is a novel written by Marie Cardinal and published in 1972. It is the story of a woman trying to reexamine her own values and free herself from social restraints after suffering a lifetime of oppression. The novel describes her self-therapy; a kind of experiment, allowing her children the freedom she never had in her own strict upbringing, and her ‘interviews’ with their friends.