Wow...I don't know how to explain how much this series is blowing my mind. Each book, so far, is very different from the one before. Each one seems so logical, when you reach the end, that you almost wonder why you didn't see it coming. I haven't been right, so far, and I hope that trend continues.
So, this book really does pick up from where the last left off, but the direction soon veers off. We're back to a much expanded theme of "how do you communicate with something that is VERY different from you." It's framed differently here, though, and has a much different outcome...more what I think Xu was hoping for in the last book.
Anyhow...this clarifies where the ongoing references to the Odyssey were leading. I think it's going to be a while before the characters see familiar shores again, or even familiar stars to navigate by. The tensions are very different in this book. They become more personal to the members of the crew. The less central, previously, characters get more attention here, too. Sarah and Inez have taken on more personality traits. Let's just say that Paul's going to get your attention in this story, too.
Keith's descriptions of space, and space travel, are quite good. His vistas are sweeping. As I read the last 20% of the book, tonight, I could picture the setting as a gas giant planet was growing ever nearer the ship, very close to it's star. It's there in colors and detail. Even the feelings as the ship undergoes major stresses are described in a visceral way you can almost feel.
There are soft moments, too, which sneak up and get you. There's a nice passage where Cal, transiting the ship, finds his exhausted communications and IT officer asleep in front of a work station. It's just a human moment in the midst of a very large story. It meshes in nicely.
One thing that's clear to me: Keith knows how to ratchet up tension within his story. It comes up incrementally, almost imperceptible at first. Suddenly you realize as you near the end of the book that you're barreling along with no idea how you got this wound up.
Bottom line: these books are really fun. They're good reads, and impressive science fiction. If that's your cup of tea, I cannot recommend them highly enough.