Zack. Armed and Dangerous, #1

Ever since bad boy Zack Hunter left her ten years ago, breaking her heart, Sky MacKenna hasn't been able to find a man who sets her on fire the way he did. Then he comes striding back into her life-bigger, badder, and sexier than before. Zack Hunter never thought his job as an Immigration and Customs Enforcement agent would lead him back to his small hometown, and he never thought he'd set eyes on Sky again.
Leaving her behind had been the stupidest thing he'd ever done, but this time he isn't going to let her go. And as soon as Zack lays eyes on Sky, he makes it clear that he intends to make her his all over again. When Sky becomes entangled in the case he's investigating, Zack can't help but take the threat personally. As the danger mounts, their passion burns even hotter.