Scarlet Raven by C.A. Wilke

With most of her past still a mystery and the man who tried to kill her dead, Scarlett thought she could live a normal life.

She was wrong.

As rogue shadow-military units and world governments vie for control of a new nanite technology, she has to face them both to discover the truth of humanity's future - and how she's involved.

Once again, she'll have to become the Scarlet Angel in order to protect everyone and everything she cares about. But when the plasma blasts start flying, she may just find that the harsh truth of the future could cost her everything.