Quietly terrifying psychological horror

We Have Always Lived in the Castle - Shirley Jackson
Although this book was first published in 1962, the idea of two young women protecting each other to the extent of letting others die to sustain their close relationship is universally and endurably chilling in a world where we are encouraged to believe that women (and especially sisters) should be constantly in competition with each other.
It is considered a masterpiece and with its quiet and subtle narration, the introverted and defensive family in their “castle” and the suspicious and hateful villagers, lacking only in pitchforks, it is a powerful and richly layered read. Truths are gradually revealed that allow the reader to make sense of what initially appears strange and senseless. The fears shown in the book reflect Jackson's own fears and it seems all the more potent because of this.