This final book in the trilogy follows two storylines: the first half is primarily about Mamm's struggle with pain, while the second half focuses on Nick's disappearance.
While the writing, wasn't awful, there were a lot of things I found disappointing or unbelievable about the story itself. THE CONTENTS BELOW WILL CONTAIN SPOILERS.
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My first problem with this was the resolution of Mamm's story. While I appreciate that things weren't magically better for her, they came pretty close: she's suddenly pain-free and strong and getting out of the house regularly when before she'd been homebound for years; at the end of the book, she even feels tingles in her legs. This whole story thread felt too good to be true. I know that we're supposed to see Beth's pure faith and her incredible dreams and be awed, but... I truly would have liked the story better if Mamm had died. I think it would have been more realistic (especially since she was on the brink of death for a while and then seemed to magically regain her health even before seeing the doctor, as if just the hope was enough to cure her weakness) and would have provided an opportunity for Rose to struggle with grief. Perhaps Lewis felt like she had enough struggles going in this book, but I was disappointed at such a quick, rosy ending to this thread.
My second problem was with Hen. I mean, in the second book, she's completely 100% loving everything about the Amish lifestyle. And I know that she needs to compromise to save her marriage, but it surprised me that makeup and clothing were things she happily returned to. I can understand the convenience of electricity and cars, but after her complete disdain for the clothing she left behind, I found it shocking that she returned to it so happily. I thought maybe she'd go for simple dresses or maybe modest modern, but the makeup seemed like a pointless concession, and the whole thing felt false after her way-over-the-top-opposite behavior in the last book.
Then there's Rose. She's been so careful to distance herself from Nick because of his worldly leanings--even going as far as to essentially cut off contact and get engaged to Silas in the first book, willing to marry someone she doesn't fully love for the sake of her faith and principles. And now I'm supposed to believe that she'd really get into a long-term relationship with a guy who isn't a church member and seems to be constantly pushing boundaries? I know he's from another district and thus there's much she doesn't know about his daily life, but I'd think that his enthusiasm for working for an English farmer and his coolness toward his more conservative twin would have been immediate red flags; having him openly admit to going biking and driving a dune buggy should have had him out the door. Maybe we're supposed to think that she's just gotten desperate enough for marriage that she's willing to compromise, but after her sister's experience, this strikes me as false.
Speaking of things that strike me as false: Nick. Yeah, I can believe that he's always been good-hearted, but I find his complete and total 180 personality change to be unbelievable. When he leaves town, Rose has said that he shouldn't stay because trying to force himself to be Amish would kill him; then, less than a year later, he comes back--having had positive experiences on the outside with his work at the homeless shelter and having deliberately finished his semester at community college--and he's meek and mild and suddenly wholly Amish. If it took Hen five years to wander back, having had no outside experience and only the burden of caring for her mother to run from, I find it hard to believe that eight months would be enough to turn a boy who spent the first ten years of his life in the outside world and was tormented daily by his Amish brother in the decade he spent with the People.
Finally, I was waiting this whole book for Lewis to pull out that "Nick can somehow sense when Rose is in trouble" card and have him come rescue her. I mean, why even bring that up in the first book if you're not going to use it later in the story? And there were a couple places when I was sure she was going to use it--like when Rose was in the ravine alone and thought that if anything happened, no one would know where to find her; or, better yet, when Rose was taking George out to visit Hen the evening that Isaac was out of town (and Nick was home). Why would she talk about how restive George is or how she's slightly nervous because she hadn't ridden him in a long time if she wasn't going to follow through on those tidbits and have the horse throw her?!