3.5 stars, rounded up.
Perhaps the thinnest mystery of the three, but there is good character development...mostly.
Merry and Curt's relationship is threatened by a possessive business connection of his. Merry, as usual, is self-centered and doesn't listen to Curt as he shares about doors opening for some good connections in the art world. And, as usual, is determined/foolhardy in the face of danger but a waffle about Curt's love for her. She needs a counsellor to walk with her through all of the damage Jack caused in their six-year-long relationship before being in another serious relationship. Also, her prayers tend to come out as "God is my helper when I do stupid things."
The literal overnight transformation of Randy, the son of Merry's co-worker, is far-fetched. If he had been both abrasive and caring earlier on in the story (rather than just a jerk), it might have been more believable. You really want to give the kid a spanking in the first half of the book but he becomes pretty likeable by the end.
Overall, I'd say the theme of this book was trust (trusting God, trusting your partner, trusting your gut, not trusting a habitual liar/abuser, etc). Hopefully fictional Merry matures more as a person and as a Christian (bringing all of your unsaved friends to church doesn't magically fix their problems/personalities) in her happily ever after world.