The Perfect Stranger by Melissa Jane

The Devil is like a shadow.
It follows.
It waits.
Gabriel Nicholas Santos. Born with a name belonging to saints, yet evil to the core.
When he smiled, people would die.
When he lost control, hell would open up its fiery gates. He was nothing more than a malevolent puppet to his elusive uncle.
Together they were LOS SANTOS cartel, rulers of South America’s most feared and powerful drug empire. The price on their heads was high. The price of becoming one of them? Even higher.

Both were my targets who knew the game well. While one kept me close, the other became a myth. But I would wait. I would watch. I would become just like them in order to finish them both.
But it was never going to be that easy. Not now. Not with… her.

Gabriel had his sights fixed on FBI Agent Nina Cross. Strong. Beautiful. And none-the-wiser of those who shadowed her every move. She held the answers he had killed so many for. She was the one thing stopping LOS SANTOS from taking full control.
And I had one job. To both save and destroy Nina Cross. But that was only the beginning.
Only when you cover your enemies with dirt are they truly gone.