Well, I knew before I clicked on your post that it would be expensive for me. I've ordered a couple of your recommendations, and preordered another. I think I have Carlene O'Connor's book in my to-be-read pile, and, after reading your review of Matthew Quirk's book(s), I thought his name rang a bell. No wonder- I bought HOUR OF THE ASSASSIN when you mentioned it earlier in the year, and it's been buried in a bin of waiting-to-be-read books that I just upended this morning to see what I was missing. The only books on your list I've read were the ones by Maddie Day and Margaret Dumas.
Two of my favorite mysteries this year were Hank Phillippi Ryan's MURDER LIST and THE LAST FLIGHT by Julie Clark. THE SILENT PATIENT was a favorite, too, but that came out in 2019 and I was just slow to read it.
Authors I discovered this year and have since become hooked on:
Nancy Warren, particularly her Vampire Knitting Club series
Sulari Gentill - I've read two of her novels, and have two more waiting to be read
Maddie Day and Margaret Dumas (both mentioned above): I've read almost all of Maddie Day/Edith Maxwell's books now, and all of Margaret Dumas' movie palace mysteries. Two of Margaret Dumas' Charley Fairfax mysteries are in my waiting-to-be-read pile. If she has written anything else, I'll be adding those, too.
Hannah Dennison has written the Vicky Hill series and the Honeychurch Hall books. I've read one from each series and have more in my waiting to be read pile.
Michael Stanley - I've been familiar with his books for a long time but got hooked on his books this year.
Elly Griffiths - I had read one or two of her books, but after reading a feature about her in Mystery Scene, I started collected as many of her books as I could find. I've read several of them and really enjoyed them. I still have a few left in my waiting-to-be-read pile. I'm reading as fast as I can!
Now I have a question for any of you - I'm interested in a 2019 book called THE GHOST MANUSCRIPT by Kris Frieswick. It's a mystery with paranormal elements. The reviews I've read are so varied, I can't get a good feel for the book. I have so many books already in my waiting-to-be-read pile, it's not like I NEED to add another book to it. But I like King Arthur stories, I'm not averse to ghosts, and I like puzzles and quests. Have any of you read this book? I'd value your opinions. Thanks!