“The Guest List” by Lucy Foley.
It’s one of those books with so many good reviews from reviewers you trust that you just stick with it, hating every character and every new chapter. You think that you are the problem for not seeing what everyone else claimed was a great murder mystery. You just know that at some point it MUST get better. Then it just ends and you realize that you just wasted your book reading time on a piece of shit.
I got about a third of the way in and then just read spoilers. It was not a good book.