A Time to Heal by Barbara Cameron

Chris Matlock, a wounded and weary ex-soldier, just wants peace in his life, and he believes he's found it when he visits Matthew and Jenny Bontrager. He envies their happiness and simple life but doesn't believe that that life is meant for him. When he meets Matthew's sister, Hannah, a small spark of hope flares within him. Despite the clash of cultures between the former military man and the pacifist Amish woman, Chris and Hannah fall in love. Chris settles into life in the community, helping Matthew with the farm. Then the threats begin. At first, Chris plans to leave in order to protect Hannah. Then he discovers who his enemy is and realizes that he must stay and face his adversary, even if it means revealing a secret he hoped would remain buried forever.