Stains of Desire by Maggie Cole

Everything about this mission is a first. The hemisphere we’re in. The lack of direction from headquarters. The stunning redhead I rescue and inappropriate thoughts I can’t keep to myself.
But the filthier my mouth becomes, the more she responds to me.
Then I learn about her daughter. Santiago kidnapped them together, then ripped Millie away and used her as a tool to make Penelope obey him.
I vow I will find Millie and deliver her to safety. But the clock is ticking. And Penelope makes me promise her something I don’t want to.
If I make good on this promise to her, the window to save her could close.
I risk losing her forever. There is no choice. I have to save them both or die trying.