I'd be remiss in my review if I gave away spoilers, so suffice it to say there's so much going on in this story that you'll be on your toes at all times. Who truly is the villain? Are there different stages of right and wrong, or good vs evil? Does perspective color righteousness? Decisions and actions form repercussions, and all Variant species will suffer for their choices. The first book surly sets a tone of trouble for the future, so be prepared for more obstacles along their journey. With plenty of action, you won't be bored! I enjoyed it greatly.
While the story was easy to follow, the tandem writing gave me pause at times. Both authors did a good job covering their parts, but there was some discrepancy in the flow of the dialog. When asked about the issue, the authors explained they were addressing the style to form a more solid continuity in book 2. I'm looking forward to it.