Il diario di Edith

The diary format creates such an intimate and unsettling view of Edith's mind. I wonder if this was planned from the start or evolved during writing.

Her perceptions seem so layered and ambiguous — was she intentionally made to be an unreliable narrator to heighten suspense?

Edith's mental state is central to the story, but it feels nuanced rather than preachy. Did the author aim for realism or symbolism in her portrayal?