Halo Primordium. I really don't even know where to start with this book. This book really defines the term, mind = blown. I mean, so many questions were answered in this book, but it raised 2 times as many more.
I don't want to spoil too much, but... the book is told from a very... interesting point of view. I'll leave it at that. It picks up where Cryptum left off. Chakas lands on a mysterious planet, and after a little observation, he discovers he's on a Halo. He meets another human, Vinnevra, and her grandfather, Gamelpar. They spend most of the book trying to find a way off of the Halo, and searching for Chakas' friend from Halo: Cryptum, Riser. But they soon encounter bigger problems, and cross paths with evil itself. They soon realize that getting off of the Halo isnt their top priority.
There really isnt much to say without giving away too much of the book. But it definitely confirms that Halo 4 will have much to do with the Forerunners, and quite possibly Precursors and (brace yourselves) the Flood. While the latter may turn many Halo fans off, it just shows that Halo has never really been about the Covenant, but the Flood. Thats the true enemy here.
While the book started off quite slow (like Cryptum), it soon picked up and became full of suspense and mystery. This is truely one of the best books of the Halo franchise, and is a must-read before playing Halo 4. 5 out of 5, 9 out of 10.