 The film is based on Pierre Boileau (qv) and  Thomas Narcejac (qv)s novel "Celle qui nétait plus" (She Who Was  No More). Alfred Hitchcock (I) (qv) also attempted to buy the  rights to this novel; Boileau and Narcejac subsequently wrote  "DEntre les Morts" (From Among the Dead) especially for Hitchcock,  who filmed it as _Vertigo (1958)_ (qv).