There are 2 books in the Princess Irene and Curdie series. The newest book is The Princess and Curdie which came out in 1970.

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…
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The Princess and Curdie

Book cover of The Princess and Curdie

Princess Irene's great-great grandmother instructs Curdie to visit Gwyntystorm, the place where the king and his daughter have become unsuspecting targets of the royal court. He plans to use natural and magical gifts to save the king from impending danger.

Following the events of The Princess and the Goblin, Princess…