All three books I’ve read so far have a different “atmosphere”. Each book is separate from the others, except for taking place in the same universe and rough timeline. The first book seemed like a lighter read, as if to easily draw the reader into the universe and give a glimpse of what it is all about. The second focused on dolphins on an aquatic world, and the third had a lot of politics that were mostly played out by chimps and gave a lot of detail about the way different species interacted. I enjoyed all of them.