Loved this book, very cozy, and way more powerful than expected--and more than it should be! ;) I thought the characters navigated their situation very thoughtfully, tactfully, and with plenty of suspense.
Only two small issues; the daughter, Katie, is eleven years old but speaks like/uses the language of a 6-7 year old. It is quite odd and compromises the narrative. Not a huge problem.
Even less of an issue was more of missed opportunity. Several times in the first act the two Rachels question whether they will be friends, or have any sort of relationship. Like Chekhov's gun, this feels like a setup for something greater, yet at no point during the third act or Christmas supper do either of them use the word "sister," which I'm sure many readers were expecting. Though they aren't originally or biologically sisters, because they share parents (in multiple senses), they very much are sisters, and in many respects I believe the book teased that sentiment and failed to deliver. Not a problem, like I said, but that would've added a whole star in itself.
Thirdly, and again not major, I felt the romantic element was totally unnecessary. It felt shoehorned in, like more of an afterthought request by the publisher than an original part of the narrative. I realize it is a common trope of the genre but it felt like a hard distraction to the much more interesting plot at hand.
Overall it was a beautiful read, and a welcome part of my Christmas this year.