Marion Dent is recovering from injuries, both physical and mental, leaving Fifth to do her best to keep them both safe until they find where their next target lies. As memories plaque Dent's conscience, Fifth struggles with her own as she reluctantly begins to choose what is necessary for survival over what she knows to be morally right.
In Las Vegas, a controversial security system overseen by an ex-military group is being put through its final test. Its creator, an engineer as brilliant as he is reclusive, has an opportunity to change the futureor rectify his past.
He is their target, and both Fifth and Dent will sacrifice what they have, and who they have become, to acquire him.