Perfect Dark: Initial Vector

The year is 2020: Corporations control everything. In the name of domination, these sprawling organizations have recruited their own military forces to fight clandestine battles against one another---a war fought in the boardrooms and won in the shadows, with the public none the wiser.
Ex--bounty hunter Joanna Dark has unwillingly seen the front lines of this war. Her run-in with dataDyne, the world's most powerful hypercorporation, has left her with a wound that only vengeance can heal. Daniel Carrington, the charismatic founder of the Carrington Institute, has been locked in an ongoing war with dataDyne for years and sees Joanna's deadly skills as the key to victory over their mutual enemy. But Joanna is young and lost, unable to accept her abilities as virtues or fully trust Carrington's intentions.
But when an explosive secret is unearthed---one that could finally bring down the threat of dataDyne once and for all---Joanna finds herself thrust back into the fight, one that brings her face to face with her past . . . and the forces shaping her future.

Greg Rucka is an acclaimed thriller novelist and commonly considered to be one of the "Big Three" writers at DC Comics.