I found this one better than some of the more recent ones. I thought Penny was clever in how she wove the story together through various timelines… if not done well, it's too contrived and confusing in my opinion but in this case, I found it to be very effective and added to the exciting build up of the mystery. I also liked this one better than some in the past because the quirkiness of the characters wasn't 'over the top' as I've found it to be in previous books.
The story was about drug trafficing plus a 'revenge' killing from years in the past. As usual (essentially in all but her first two books), Penny has the reader focus on a current murder but is also telling or building a 'back story' which is actually more the focus of the story. But, again, I feel she does this really well... and it's very very smart because it keeps everyone reading the whole series. However, ironically, this book could 'stand alone' more easily than others, in my opinion.