Knox's Woman. Villains, #3

Knox works alone. As a contract killer, he will do any job for the right price. However, that also means saving people. His current job is to keep a rich man alive, before his current wife kills him. Thankfully, his beautiful PA, Ava Martin, is happy to help him. Three years ago, Ava found herself at the mercy of a serial murdering rapist. She would have been his next victim, until Knox saved her.
She witnessed him kill a man, but she didn't care. Knox would keep her alive, so long as she agreed to work for him. That day, Ava fell in love, and she'd been falling for this man ever since. As for Knox, he couldn't live without Ava. She had taken his empty world, and filled it with so much more. But, he would not cross that line. Ava worked for him. That didn't mean he wasn't tempted. Until, one day, he gave into temptation and finally claimed her virginity.
He cannot stay away from Ava. He craves her. But, his greed will come at a price. Will he be willing to pay it to see his woman again?