Susan supposes she has only mentioned it in the context of the dagger she drew from his experiment. "It was," she says. "It was another world. We got there the first time through a wardrobe, of all things - it didn't have a back, it just kept going and going, past the coats and into a wintery forest. We had to liberate it from the White Witch, and then we ruled it for fifteen years, my brothers and sister and I."