The story follows eight-year-old , who lives in a secluded castle on a mountainside. Unknown to the surface dwellers, the mountain is hollowed out by a race of goblins —former humans who fled underground generations ago to escape taxation and have since devolved into physically distorted, intellectually sharp, and deeply bitter beings.

The narrative weaves together two distinct threads: Irene’s discovery of her magical heritage through a mysterious great-great-grandmother who lives in the attic, and the mundane, grounded world of Curdie, a brave young miner boy. Curdie works in the dark tunnels, fearless and practical, while Irene discovers a magical room in the castle’s highest tower, inhabited by a beautiful, ageless woman who spins moonlight into thread.

In the pantheon of classic children's literature, certain names dominate the conversation: Lewis Carroll, J.M. Barrie, and Hans Christian Andersen. Yet, nestled between Alice in Wonderland and Peter Pan sits a quieter, more spiritually profound masterpiece: .

The antagonists of the story deserve special attention. MacDonald’s goblins are unique in the annals of fantasy. They are not a separate species entirely, but rather humans who, over centuries of living underground, have devolved. Their hatred of the sun and their monstrous appearance are physical manifestations of their moral corruption.

George MacDonald was a pioneer of the fantasy genre, often referred to as the "grandfather of the Inklings." His writing was deeply influenced by his Christian faith, German Romanticism, and the folklore of the British Isles. Unlike the heavy moralizing of many Victorian children's books of the time, MacDonald sought to cultivate a sense of wonder.

More than 150 years after its publication, remains a singular work of art. It does not fit neatly into any genre. It is too strange for pure fairy tale, too simple for high fantasy, too religious for secular literature, and too dark for most modern children’s books.

Curdie’s greatest flaw is his refusal to believe in the grandmother. He sneaks into the tower, finds nothing (because the grandmother chooses to be invisible), and decides Irene is a liar. His rationalism blinds him to the higher truth. MacDonald warns that pure logic, divorced from wonder, leads to a dark, goblin-like existence.