Karma

Nikki Renolds has had many instances in her life where she had to make deals with the devil, mostly to protect her little sister, Leo. What if Leo goes missing? What if Nikki can't find her? What if the devil can't help her? Well, she turns to the devil's brother, instead. He makes a deal with her that, if she kills this guy named Charlie Maddox, he'll get her sister back. The catch is that he's a not-exactly-trained assassin, who works with four other guys. The OTHER catch is that he's made deals with the devil himself.
Will Nikki get Leo back?
Will she kill Charlie?
Or will all those sins come back as karma?