Mercenary

Mercenary- (of a person or their behavior) primarily concerned with making money at the expense of ethics.

Brendon is a mercenary. Emma is a criminal. In the world they're living in, you're either one or the other. That or a cop of course.

Brendon is the best in the business, he never fails to hit his mark, except for this time.

Emma kills people. It's as simple as that. Socialites, politicians, anyone for the right price.

The police have named her the Ghost Killer, which she finds to be absolutely ridiculous, since she leaves no evidence whatsoever. She likes to call herself Emma, since that's her name.

Brendon doesn't beleive in authority, and he certainly doesn't belive in the police. Which is why he's not a cop, too many restrictions in his opinion. But he does beleive in justice, he beleives that the bad guy should die in the end and the only way to do that is on his own.

So imagine his surprise when they come to him for help, it's been two years and their methods aren't working. So for $200 a day, he has full access to all police records so that he can find, and exterminate, Emma.