"There was no black and white in my world. It was black or blacker. And I was the blackest of them all."

Xavier "X" Blood only remembers the last few years of his life.
Trained as an emotionless and deadly assassin, he goes through each day crossing out names on a never-ending list, not once asking why they deserve what he delivers. Death.
Then one day, his programming starts to unravel and it's all because of her.

Mercy Reid has a secret. A big one. The kind that will get her killed if it gets out.
Looking to get lost, she runs from one hopeless situation and falls into the clutches of a monster. A monster that was programmed by the worst of the worst to kill without remorse. A man who is looking for her.

When X is given his latest target, things become muddy. He knows his mark is right in front of his eyes, but he doesn't want to acknowledge it. He's literally losing his mind after all.
Will he defy his programming and save the woman who has made him feel again?
Or will he pull the trigger?