Ruthless King - Dark Syndicate, #6

The truth hurts, but lies can kill. I offer to do anything to save my father's life when he's captured by the devil he owes a debt to. A three-million-dollar debt. So, I became the devil's spy as I enter the lair of the Cartel King to take a job as a live-in nanny for his niece. My orders were simple. All I needed to do was this: Get close to the Cartel King. Be his to do anything he wants me to do.
Make him trust me enough to tell me the secrets his enemies need. Do that, and I will save my father. I just never expected to fall in love. Or that Alejandro Ramírez would be the first man to heal my broken heart. When he discovers the truth, I may wish I'd died instead of making that deal with the devil.