This book was a fun, easy read, with moments that made me laugh.
The writing is very accessible, not a high reading level, but I still enjoyed it, as an adult.
The characters were fine, though not hugely developed. Sometimes I forgot who was who. The cat was cute.
The plot was all right, but anticlimactic. The author seems not to have followed the standard Aristotlean dramatic structure and the end felt a little flat to me, but obviously, there are sequels and maybe this book isn't supposed to be the END end.
The author's descriptive passages I think were the strongest point. Most of the time, I got a nice image of the locales.
As for the quantum physics stuff, I thought it fairly simple and not a stretch for my brain.
As for the religious stuff--yes, the story takes place among a bunch of friars, so it's Christian and there's lots of talk of "my Lord" and crucifixes and heaven (little mention of hell). But, the author stretches that into a sort of universalism, as mentioned by another reviewer, and includes a broader view and other aspects of spirituality. So, this story is not for the close-minded. It's a fine story for agnostics or people who can read a nice story without frothing at the mouth and feeling attacked.
So overall, a nice easy story, if a little bland. There was potential for adding tension and pushing farther with the physics stuff, spiritual stuff, and the plot line in general, but the author seems to have shied away from that, and if she had gone there, there would be people really making a fuss about the religious stuff, so maybe it's just as well, but I don't think I'll read the sequels.