I like to keep a few inexpensive cozy mystery box sets on my Kindle, for those times when I don't want to read anything too serious. Most of them are as substantial as cotton candy and as credible as TV sitcoms (at least those I remember from the 50s and 60s). Many feature female amateur sleuths who are proprietors of book stores, craft stores, or bakeries in a small town, or something along those lines. So I didn't expect too much of this set. It was just escapism from the reality of the daily news.
This series is a little different from the norm. For starters, the "Granny Vigilante" is a retired police detective who has gone rogue, tracking down and disposing of evildoers. She operates in Toronto, Canada and is in off-and-on contact with the police department there. (One can hope the Toronto police are more competent than the Keystone Kops portrayed in the books.) She somehow persuades several people to join her crusade, even though it's not usually in their best interests to do so. The results are comical as well as appalling.
I found the progression of the stories interesting. The major players begin as caricatures, but gradually fill out into three dimensional, complex people who are capable of growing and changing. The writing quality also develops in the course of the series. At first it's a bit, for want of a better term, clunky. It doesn't flow smoothly and I almost gave up on the books. But it gets smoother as you go.
It's not deathless literary fiction, but overall it's not bad at all for the genre.