How does the author use foreshadowing in The Prague Orgy?

Eva's story of leaving her husband for a Jewish man foreshadows the narrator's selfdiscovery of his Jewish roots. When the book begins, the reader knows Zuckerman is Jewish due to his name and because Sisovsky says so. Zuckerman, however, doesn't comment on his Judaism. During Eva's story, Zuckerman listens intently to Eva's descriptions of anti-Semitic behavior. At this point, he is merely an observer within Judaism, but later on, he will be a participant.