09 - Enchanted Castle by E. Nesbit

When three children find themselves spending their holidays at school, they embark on an unexpected journey filled with adventure. Their quest leads them to a magical castle that seems plucked from the pages of a fairy tale, where an enchanted princess resides at the heart of a mysterious maze. However, the reality is quite different the castle is merely a charming country estate, and the princess is simply the housekeepers niece indulging in her imagination. But when she reveals a truly magical ring, the children are swept into a whirlwind of enchantment, where statues spring to life, lost lovers are brought together, and wishes come true—though always at a cost. (Summary by Peter Eastman)