Disruptor

Quin has spent her life as a pawn. She was trained to kill and manipulated to guarantee her family's power. And now that she's broken free of that life, she's found herself trapped again, hostage to a plot that has been centuries in the making. Her best friend Shinobu's mind has been corrupted, the Young Dread has aligned with her enemy John, and the bloodthirsty Watchers are being awakened and gathered.
But Quin will no longer be a pawn. Quin is a Seeker. She stands for light in a shadowy world. She will face the vengeance of the past and its enemies and save herself and the ones she loves - or she will die trying.