Chaos by Iris Johansen
It's been a long time since I've read any romantic suspense and I don't think I've read anything by Johansen before. Our main characters here are CIA agent Alisa Flynn and billionaire inventor Gabe Korgan. They both want to be in charge and while they bicker a lot, the attraction is clear. And that's one thing that sometimes annoys me about romantic suspense: we're in the grimy wilderness, desperate to stop the bad guy and save the teenage girls, but my mind just keeps going to sex. Really? As a couple, though, they're pretty good. They're both strong, a little short on trust, and long on independence.
The bad guys are really awful human beings. The story is violent, with rapes and beatings, but not overly graphic. And while you know Alisa and Gabe will rescue the girls, even Sasha, Alisa's ward, the tension lies is how they'll do it and how much harm will be done to the girls...