The Enchanted Castle by Edith Nesbit, Fiction, Fantasy & Magic

Three kids reluctantly spend their summer at a private school in the countryside, but their adventure begins when they sneak out and discover a hidden castle amidst a fairy-tale landscape. The enchanting park features a maze, a serene lake, and marble statues, culminating in the discovery of a sleeping princess in the rose garden. This magical setting transforms their mundane vacation into an extraordinary quest filled with wonder and mystery.