Howl's moving castle (Diana Wynne Jones)

Gr 6 Up Sophie Hatter reads a great deal and soon realizes that as the eldest of three daughters she is doomed to an uninteresting future. She resigns herself to making a living as a hatter and helping her younger sisters prepare to make their fortunes. But adventure seeks her out in the shop where she sits alone, dreaming over her hats. The wicked Witch of the Waste, angered by ``competition'' in the area, turns her into a old woman, so she seeks...

When Charmain is asked to house sit for Great Uncle William, the Royal Wizard of Norland, she is ecstatic to get away from her parents, but finds that his house is much more than it seems.