You will want to read the first book in the series Orbs in order to understand the Aliens and world that this series is based upon.
Nicholas Sansbury Smith is back with the second book in his Orb series, where water is becoming more and more scarce:
The Alien invasion has wiped out most of the life on Earth by sucking the water not just out of the ground but also out of every living thing they can find. The Oceans are slowly being drained and the survivors within the biosphere make a horrific discovery human farms where the Aliens appear to be slowly draining the life of humans that have been captured. When one of their own is captured by the Aliens, they enter into an all out mission to find him and bring him home, but nothing prepares them what has been happening outside of the biosphere.
I liked this better than the first not sure why but I was really drawn into the story and characters in this book when compared to the first. Maybe it is due to the fact that these are the people who survived the first wave and we get to know a few of the survivors better. Sansbury Smith pull no punches on descriptions of deaths (they are pretty gruesome as the Aliens want the water from any lifeforms' body) and who is alive at the end of the book, lets just say they all do not make it out in the end. Sansbury Smith knows how to keep this series both frightening, disturbing and entertaining all at the same time.
Really like the development of Alexia the AI in the biosphere as a character in this book. She changes and almost develops feelings which I find very interesting due to the fact that she is AI as well as her attachment to the humans who she watches over. Another character that was better fleshed out in this book was Sergeant Overton. He really shows a different side of himself I found in this book, as he is very much lets take the fight to them as so what if we die trying while in the first book it was more about trying to survive. But the one thing that you respect the most about Sergeant Overton is that his is completely loyal to his men and is not willing to ask them to do anything that he is not willing to do himself.
As us one of my favourite authors out there right now Sansbury Smith is one of my go to authors. I know I will be continuing on with this series to see where he takes it.