Murder Past Due is a reasonably fun but unremarkable cosy mystery. The main draws would be the cat, Diesel, who is a main character, and the fact that it’s set partially in a library. But the cat isn’t the detective and isn’t the main character, and the library is just where the main character works, so it’s not that niche. I didn’t find any of the characters or their relationships particularly compelling, though the small-town USA atmosphere was kind of interesting — I kept being surprised when there were computers and email, because it seemed more old-fashioned than that in terms of the way people related. More Agatha Christie than Val McDermid et al.
I was not, however, surprised by the resolution of the mystery.
Overall, this was fun brain candy, but I’m in no hurry to read more of the series, and I wouldn’t particularly recommend it unless you’re a connoisseur of cosy mysteries.