Nearly all life in the galaxy is descended from the same ancestor through the process of panspermia – and something is trying to kill it. The Sage of Sagittarius by Kenn Brody is a fast read. It is full of scientific details, but without slowing down the action at all. The end is satisfying without being too unrealistic (the “bad guy” is destroyed, but at a heavy cost). Each twist makes sense in the context of the story. The characters are quirky, yet believable, and fairly well developed without getting bogged down in a lot of internal musings – nothing wrong with that, but this book’s focus is on the struggle for survival between species of radically different biology (and physics).
In the course of the story, the characters encounter many alien ecosystems. I liked the mollusk-like beings that sift gold from the sea. I liked the “birds” that planted themselves into the ground and became trees. I liked the centipede-like creatures that kept harems. I loved it.