Mérimée's decades of witty, tender letters to a woman he never names, published after his death.
Books that mention Lettres a une Inconnue (1)
The Age of Innocence by Edith Wharton: “…as Dukes; he had often pictured to himself what it would have been to live in the intimacy of drawing-rooms dominated by the talk of Merimee (whose "Lettres a une Inconnue" was one of his inseparables), of Thackeray, Browning or William Morris.”