In the first few books of the series, Tricia came across as relatively unlikable, but mellowed a bit recently. Unfortunately, she's now back pretty much where she started from. As a relatively wealthy woman looking to start over, moving to Stoneham, New Hampshire to set up a mystery book shop made sense; granted, I always felt as though she were more of a dilettante then someone who really needs a thriving business for income.
As one who dislikes rehashing plots in reviews, I'm going to say that in terms of what to expect for folks who haven't read this one yet: Tricia stumbles across a corpse, does a bit of sleuthing on her own, but that is more incidental and falls to the wayside by and large. There is a fair amount of attention given to a nationally televised cupcake Bake-Off for charity held at Stoneham High School. Also, Tricia is desperately trying to be on the board of a local animal shelter, without success; this is used to introduce the theme of lab testing products on animals (cruelty).
The animal aspect of the story I found rather overdone and poorly worked into the action, such as it was; clearly, the voice of the author herself consciously working that topic into a book specifically. Peripheral to that was a rather bizarre throwaway remark by Mr Everett that he had gone to visit Franny in jail (being held for murder at Angelica's cookery shop!) to give her an update on how her cat was doing as he and his wife have adopted the animal. This was presented as a perfectly rational thing for him to do, and great surprise that the visit did not end well. Oy!
Angelica was pretty much her usual self throughout the book, being preoccupied with the opening of her new day spa. Pixie featured very little in the book to start with, but developed a minor point near the very end. Enough about them though, let's get on with how Tricia has regressed...
The overall theme of the book could be considered that Tricia is at loose ends because she's given Pixie so much responsibility that there's nothing much for her to do! That may be true in the sense that Tricia is not often present at the bookshop, with Pixie managing day-to-day (sales) operations. However, she seems to not trust Pixie with making the bank deposits or anything financial; moreover, there is great concern that Pixie has been such a great salesperson that the stock on the shelves is getting rather low. If Pixie were doing so much of the work, wouldn't she be responsible for ordering new stock? Instead, that situation is used to give Tricia a reason to go to used book sales here.
As for Tricia's personal life... two of the men she has dated since opening her store now loathe her, newspaper owner Russ and police chief Grant Baker. In this book she's dating Marshall, who owns the travel bookstore in town. He is nothing but kind and thoughtful and attentive to her, whereas she basically takes him for granted. Ugh!
In summary, she came across as a rich woman with too much time on her hands (bored with the store), hoping that being on the animal shelter board would fill some void; along with her exes, the paid director of the shelter also has taken quite a dislike to her - pattern here? There's also a very strange point where Tricia ends up having lept to conclusions; however, based on details given, I don't blame her for that. Another awkwardly done plot point.
Finally, a note on the audio edition... Cassandra Campbell has taken over from Karen White who narrated the series previously. Most of the voices she gets down fairly well, with one quite glaring exception: Pixie. The former prostitute and jailbird had been read with a very distinct New Hampshire accent; here, the voice is very generic Mid-American and sound quite a bit younger. If Ms. Campbell narrates the next book in the series, which I understand centers on Pixie, I would certainly read the print edition.