Princess Irene lives in a castle in a wild and lonely mountainous region. One day she discovers a steep and winding stairway leading to a bewildering labyrinth of unused passages with closed doors - and a further stairway. What lies at the top? Can the ring the princess is given protect her against the lurking menace of the boglins from under the mountain?

Princess Irene’s great-great-grandmother has a testing task for Curdie. Curdie will not go alone though; she provides him with a companion, the oddest and ugliest creature Curdie has ever seen, but one who turns out to be the most loyal friend he could have hoped for.