El Diablo (Killer of Kings Book 6)
Is the devil capable of love?

Xavier doesn't do trust. He breaks. He kills. After living through hell, he's transformed himself into El Diablo, the baddest motherfucker around. His only weakness is the sister he lost as a child—the one Boss promises to help him locate. The only catch is he has to work for Killer of Kings and learn to play nice with the other hitmen. He does his job, determined to prove himself. Then she walks into his life, and nothing is ever the same.

Alesha hits the jackpot when she's hired as Xavier Moreno's house cleaner. She has her own private suite, and the wealthy businessman is rarely home. Things change in a heartbeat when he comes home drunk one night, covered in blood, and telling her stories about murder-for-hire and a secret group of assassins. He also reveals a side so broken that she can't help but fall for him. Can a killer fall in love with his cleaner, or will he add her to his hit list?