An interesting series, but I suggest you don't read Episode 0, as that confused things for me. As the series develops we find out that the humans in these books have been developed by another race, the Nankuani, to be slaves, and are kept in slavery through chemical means. Slowly a number of humans begin to realize the truth through the secret help of the Knights Templar. This series involves reluctant human heroes, who are supposed to clean up the universe (the only ones capable of it??? Give me a break!). There is quite good character development of some of the persons, but the heroes seem kind of dense. Why would they be the saviors of the universe? However, a well-developed story line that keeps you on the edge of your seat.