The Enchanted Castle

On a dull school holiday, siblings Jerry and Jimmy and their friend Kathleen stumble across a grand, hidden estate in the countryside, with a lake, marble statues, and a maze at its heart. Inside the maze they find what looks like a sleeping princess, who claims the castle is enchanted and shows them a ring that grants invisibility -- until it works, and the panicked 'princess' turns out to be Mabel, the housekeeper's niece, playing a game gone further than intended. The ring's magic turns out to be entirely real, answering the children's own careless, half-formed wishes. One of E. Nesbit's best-loved fantasies for children.