Extremely well written book, the author puts us in the heads of two characters that make up the Horde, as discussed below, but never burden the narrative, and each character is a writing style. I found the book to be intriguing enough still want to continue. Namely, it is not clear at all where we come from and where we are going, but it's done well enough that this is not serious ^ _ ^ And Damasio plays with words to great effect (see chapter "The tower Aer" is pretty amazing).
The end however, I was terribly disappointed; I expected from the very first pages, I wish the author shows me that I was wrong, but it has not happened. That's the only downside I found this livbre, important enough downside, however, because the end is what we have left, even if everything else was great.