A hidden faerie kingdom faces the encroachment of the human world and the internal struggles of its own magical inhabitants. Elfin is a realm of ancient magic and intricate social structures, ruled by a queen whose power is waning. The story follows various characters within this world as they navigate the delicate balance between their magical existence and the encroaching influence of humanity, which threatens to unravel their very way of life. The narrative explores themes of tradition, change, and the nature of power within a society bound by ancient laws and potent enchantments.

Kingdoms of Elfin is a collection of interconnected stories that delve into the intricacies of a magical faerie society. The prose is often described as lyrical and evocative, characteristic of Sylvia Townsend Warner's distinctive style. Readers often appreciate the depth of world-building and the nuanced portrayal of faerie politics and culture. The collection is noted for its sophisticated exploration of themes such as power, tradition, and the consequences of societal change, offering a unique perspective on the fantasy genre.