Kenneth Oppel said this quote

I took [Kate's] hand in mine, and felt her fingers squeeze back. And I thought: home. It took me completely by surprise. But I suppose that once you bid farewell to your first home, you're always looking for another—that place where you can feel happy and strong and at your best. For three years I'd called the Aurora home. But now that I lived in Paris, it was not the city itself that was home. It was Kate.