Thirst for Bloodlust

It has been three months since the case involving Alistair Anderson. And in these three months, a mysterious organisation has been massacring law enforcement officers in several countries. However, Ava Bailey only finds out about this when she discovers that Alistair is linked to that organisation. She suspects that the organisation may be doing that to exact its revenge on her for killing Alistair, and her suspicions are confirmed when she is roped into the Evanescence Intelligence Service to become a spy to take down the organisation before it rains destruction down on Evanescence.
Her mission seems easy enough - get into the organisation's Evanescence-based stronghold, kill the leader of the organisation, and get out alive. However, as Ava goes along with it, she discovers more about herself than she has ever had before, and most of the things are so horrible that she starts asking herself: Am I evil?