Texas lawman Bo Duggan got the shock of his life when Mattie Collier showed up on his doorstep claiming one of his children was really hers. But before Bo could argue, Mattie became a gunman's target and duty compelled him to protect her. After getting the children to safety and then going on the run, Bo couldn't help but admire the way Mattie wouldn't back down from a fight.

Bo had trouble imagining a life without the little girl he'd given his heart to. And before long, he had to admit he had trouble imagining his life without her mother, too.