A Time to Heal by Barbara Cameron
from Goodread.com:
Christopher Matlock is a weary and wounded ex-soldier who just wants some peace in his life, but then he meets Hannah Bontrager, a gentle, pacifist Amish woman who turns his world upside down. Born and raised on a Kansas farm, Christopher finally finds peace in this simple community helping with the crops. He expects resistance from the Amish but is appalled when he and Hannah experience threats. When he discovers who his enemy is, he realizes he must stay and reveal a secret that could take away everything.
