At Veronica's home, there is a graveyard. And in this graveyard, towards the back fence, is an old grave. But it is not just a grave; for when Isolde moves the grave deeped into the shadows, there appears a hole. A hole that leads to a labrynth of caverns. The few who have found this maze were killed off by starvation, for though everyone can get in, only Veronica and Isolde can get out.
And through this maze, which has an entrance in both Veronica's house and that forsaken old headstone, is Isolde's home, in the earth, where she is the only one that is alive beneath the surface.
(It is a large open space, with a bed, and a large chest with a lock. Isolde gets her food from Veronica.)