Oh, today I picked up a fantasy book about a pair of young adults who travel to a world that is beautiful, however it's fragile, like glass. Its citizens are used to living in such a delicate world, but these two people, a young man and a young woman aren't. But they're also the ones who were prophesied to save that world.
[Whoops, she went on a little bit, practically giving the summary in her own words.]