A story about two children and their young nanny/au pair who is swept into another world where some of the inhabitants used to be human. By eating the available food in this place the people transform to become more mythical beasts, like fauns etc. Although the Au Pair, Kilda, is tempted she fights the temptation to find her way out of this.
It's wonderfully evocative of older mythical stories and although it has an overlay of science fiction, which adds to the confusion of the characters the core story is a very interesting quest story. The love story is also logical and makes sense in the context without feeling tacked on and silly.