A Steadfast Heart by Lacy Williams

When his family legacy is on the line, rancher Drew McGraw becomes desperate for someone to tame and tutor his three children. Desperate enough to seek a mail-order bride. But when the wrong woman arrives on his doorstep, Drew balks.
Heiress Kaitlyn Montgomery runs straight from the scandal chasing her toward a fresh start on a secluded ranch. She strikes a bargain with Drew—a marriage convenient for both of them.
But the more Kaitlyn adapts to ranch life and forms a bond with Drew’s children and their enigmatic father, she realizes that this ranch is where she is meant to be. And then her past catches up with her…