If You Don't Know by Now — Teresa Southwick

A decade ago, good-girl Maggie Benson took a walk on the wild side with brooding bad boy Jack Riley. They'd generated enough chemistry to blow Destiny, Texas, to kingdom come. But an army-bound Jack had disappeared after a night of passion, leaving Maggie with more than just memories....

Then Jack blew back into town. But he was the one left shell-shocked. Not only did the spirited single mom still make him ache in all the right places, but she also revealed a life-altering secret. Would a fearless Jack take on the most daunting mission of all -- claiming his family?