Protecting the Colton Bride by Elle James

With his ranch in financial trouble, cowboy Daniel Colton makes the perfect proposal to Megan Talbot--a marriage of convenience to save his business and ensure she receives her inheritance. But when a killer targets his new bride, vying for her estate, he must race against the clock to track down the culprit and protect the wife who's starting to be so much more to him than just a business partner.

Colton's Cowboy Code by Melissa Cutler

Cowboy Brett Colton has reformed his bad-boy ways. And he has ambitious plans to transform the Lucky C ranch. Then he discovers that his one passion-filled night with gorgeous Hannah Grayson resulted in pregnancy. Though excited by the prospect of fatherhood, Brett puts the brakes on romance. But he doesn't anticipate the strong feelings he develops for Hannah...or that he is putting her in danger. Because a vengeful phantom is targeting the Coltons...