A Wife for the Rancher by Jody Hedlund

In the high country of Colorado, hardships are a given, but love has a way of overcoming all the losses.

Millionaire heiress, Genevieve Hollis, has everything she wants except one thing, freedom, because her guardian stepmother insists on overseeing every move she makes. When Genevieve sees a newspaper advertisement from a rancher seeking a mother for his baby, she jumps at the chance to escape, even if that means hiding her true identity.
Ryder Oakley has suffered the repeated misfortune of losing the people he loves most, so now that he’s a single father with a newborn baby, he’s determined not to lose his son. When a woman shows up in answer to his advertisement, he quickly forms a marriage of convenience—one without all the entanglements of a real relationship.