I already knew this was an intricate and delightful book; I read it for the second time to get a better grasp on the ramifications of the plot. There is a happy end, of course; in absolutely Victorian style, there are weddings in the end, and kittens. But I also got a better perspective on the - slightly downplayed - "science"-part of the book: how the improbable can be explained by constantly refining hypotheses. Which is, after all, how science works. And: I love how people get all woozy and sentimental from doing too much time travel.