Nice but ... 4 1

A story full of fantasy (werewolves, magical characters (the heroine, a witch, vampires and so on).
So a small side "melting pot" that would appeal ... or less.
Strengths: apart from the historic area (! A "warlord" dominating a "tribe" in Vietnam, lol) the author has put his side a high quality documentation enabling it to add technical details its very realistic story, especially when it describes its werewolves and lupine Influence (systems of domination in wolves, animal behavior: super) This gives a serious (also: "scientific" language in the description of a mixture ...) useful in a world otherwise very fanciful.
Now ...
Too many characters!
We find it no longer sometimes.
Heroin is nevertheless friendly, dynamic girl with head on his shoulders, not a male (a real American, what, lol).
If, like me, you're not passionate about werewolves, some passages linger long.
By cons: Briggs shines through effective description of Scenes "Hollywood", which make you be born action so dear to American cinema in a few lines and without downtime!
That's why I give it to the final: 3/5