Qui est Sylvia ?

From Author Wars - https://authorwars.com/books/qui-est-sylvia-1807087.html

Overview:

Title: Qui est Sylvia ?
Author: Cynthia Asquith
Year: 1972
Type: Short Fiction

Editions/Publications:

Unknown. De l'autre côté de la porte (Unknown, Cynthia Asquith, Casterman, ISBN-10: 2203226188, 245 pages, Hardcover, Anthology)