While a bit light on action, the concepts and writing are good enough for 4 stars. Spoiler alert below.
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SPOILERS***
As the first book in a series, Zarena has a lot of weight on its shoulders. It needs to set up a highly complex universe with lots of races, some human, most fantastical. And these inhabitants of the universe (it's multi-planet) are sometimes direct analogies to familiar stories. The creation story is the basis. The whole Seraphym Wars concept is right out of Milton. Laud is the god who creates the seraphym. One of those right-hand angels decides to revolt and the schism between good and evil persists through centuries.
Another familiar aspect out of fantasy lore is the concept of a Chosen One. In this case, Zarena is destined or prophecized to lead a group of children called the Vigorios against what we assume are the bad guys (the fallen angels). This is a big surprise for 14-year old Zarena when she wakes up in a monastery-like building run by the Conscientas. They're Laud's advisors and the beings that will equip Zarena to lead this children's war.
Essentially, this is all that happens in this first book. Like I said, there's an a lot of background here and without it, the reader could easily be lost in the many strange names for the various seraphym and other minions of both sides of the battle.
The weakness in this first book for me is that not much happens other than Zarena learning the tools of the quest thrust upon her. All of this is well-written and kept me reading, but I was a bit let down at the end by not at least hitting the road to find the other Vigorios (recognized by the aura they give off). We get to meet only one demon/alien and it doesn't do much other than try to pry information from the unsuspecting girl.
I just KNOW that the books to follow will provide the satisfying confrontations and difficulties. There just wasn't enough meat in this book.
In Ms. Russell's "Odessa" (a YA version) we are in the same world as Zarena, but focusing on an older girl who is also to lead the Vigorios. So, I'm a little confused whether these two forks in the Seraphym road should be read together or kept separate. I will say in defense of the series that Ms. Russell is an excellent writer and has come up with a complex fantasy world. No qualms about that. I definitely want to know what happens next to both Zarena and Odessa. I'd love to see an explanation of the interaction of the two series, if there is actually meant to be one. I'll have to nose around Rebecca's websites and blogs to learn more.