You know how sometimes you read a certain book and as the narrator or the main character dwells deeper and deeper into something at the expense of their sanity, you, as a reader, can't help but dwell with them too. On the first few parts, it was already hinted that the woman is suffering from postpartum depression after giving birth. But given the time that this was published, and sadly even now, as we live in a patriarchal society, women's mental illness are sometimes dismissed and are deemed as just women being "too emotional". I didn't expect that ending but I must say that's the most plausible things that could result given the situation of the book. Weirdly enough, I kept imagining the characters (the narrator and her husband) as the couple from Crimson Peak. Also, if you like works like Shirley Jackson's The Lottery, then you should definitely read this.