This story is plodding in places and the characters are not fully developed. The hero, Gabriel, is stiff and wooden while the heroine, Moriah, is a bit wishy-washy and clueless. I think most women--even good Christian ones--put face-to-face with the "other woman" would be angry, would show some angst. Was the author afraid of giving offense by showing Amish characters as real people? Amish are genuine and vibrant and don't always control their emotions--especially under the duress depicted in this book. In other words, they are human!
You have a man who has left his wife and his faith for another woman, yet he does it so casually, and leaves only a short note. Not realistic. The author missed a wonderful opportunity to get some emotional value into the book and deal with the real issues. It is never explained with any viability why Levi left his new wife. If he wanted to go, why did he marry her in the first place? Because he "hoped being married would make it go away?" Not good enough.
All that said, I will give the author kudos for an excellent plot idea, if executed without verve, and will read more of her work.