"Well, you know. I am rather important here, my lord brother," Amy says, with a horribly straight face that almost lasts until she finished the sentence.

But she sobers, a bit, before she continues.

"I remember, from when I was stuck there all those years ago. It's this amazing, wonderful place, full of so many things you never could have thought of at home, people from places you can't begin to imagine.

"And you reach the point where you think you'll scream if you can't get to some place where you can't reach an edge and find yourself back at the beginning."