Runaway Heart (Hearts of Three Rivers #1)
Amity Lassiter

Dane Baylor already has his hands full running the family cattle operation when a tragic accident leaves him as his young nephew's legal guardian. Before long, he finds himself over his head and desperate not to betray the trust his brother put in him. He doesn't know how badly he needs Ren until she shows up and balances out not only his life but his heart.
For the first time in years, Ren feels safe, and despite her best efforts, believing in the happy life she could have with the man who offers her the love she's never known. But when her past comes knocking, threatening her new family and her new life, she may have no choice but to fight for everything she holds dear.