Angélique: Marquise of the Angels was originally published as part of an 800-plus page volume that also included book two in the series, Angélique: The Road to Versailles.
However, in the UK and other countries these books were later split into two volumes. So the numbering on various published editions is confusing.
Golon, Anne originally collaborated with her husband Serge prior to his death, to write the novels which all bear the name of Golon, Sergeanne.