A prickly, sapphic octogenarian puzzle master is the main character so HELLO I was obsessed with her from the beginning. There’s a great supporting cast too, I enjoyed so much of the book. There is a jigsaw puzzle at the center of the mystery, as well as a lot of anagrams. These kind of got lost in the audio, but if I had been thinking more deeply about the MC’s blind spots I probably would have caught at least one of them. 
My only real gripe is the ending. I don’t think the solution came together particularly well, or was revealed well, but I overall still really enjoyed the book, and especially Edie.