Shadow Hunt - L J Kendall - Bog

Leeth: Experimental subject. Government assassin.
Threat to humanity.

2062, 26 years after magic unexpectedly returned to our world. In the Dumps outside New Francisco, eighteen-year-old Leeth is on the run. She doesn't regret sacrificing her future to save her friend, but the ruthless covert agency she worked for and her controlling uncle want her back.
Despite the loneliness and hardships, Leeth is relishing her freedom, and is determined to honor the promises she's made.
But things are worse than she knows. Thanks to an insane mage's tampering with meta-magical Archetypes, a uniquely altered killer is hunting her. And in this case, what she doesn't know can doom her - and everyone else.

(A warning from the author:
There are still some dark passages, but less than the previous two books. The story is now well under way. I think of this book as: Leeth kicks ass.
I don't think you'd have to have read either of the previous two volumes in the series, although you would find yourself in the deep end of the pool!)