Thereupon Heloise found herself pregnant, and was carried off by her lover to Brittany, where she gave birth to a son.
To appease her furious uncle, Abelard now proposed a marriage, under the condition that it should be kept secret, in order not to mar his prospects of advancement in the church; but of marriage, whether public or secret, Heloise would hear nothing.
All this time Heloise had lived amid universal esteem for her knowledge and character, uttering no word under the doom that had fallen upon her youth; but now, at last, the occasion came for expressing all the pent-up emotions of her soul.
La Nouvelle Heloise appeared in the same year (1760), and it was immensely popular.
Here is some sort of Key to the Mysteries that your Heloise has sent you.