YA + Cliffhanger + coming-of-age = not so hot. Heroine's calling in life is killing post-apocalypse monsters for her tiny, idyllic Colorado mountain community. But ... she is forced to move to the east coast (to do the same thing) or her family will be in deep dodo with shadowy, nasty bureaucrats. 
 I've always enjoyed Mercedes Lackey's novels, many of which are coming of age tales. Here there is just too much telling (rather than showing) for my taste. Plus, our heroine is indeed brave and she is adept at slaying monsters of all types. Better than most of the boys. But she isn't that quick on the uptake, to my disappointment. 
 I really dislike cliffhangers. Perhaps it is simply that, as I get older, my fingernails have lost some grip strength. 
 Book two, Elite Hunter, is better than book one.