Which One?

Nora Roberts is a prolific author. I like a lot of her books, especially the J.D. Robb In Death series. Audible does not allow grouping by authors. It alphabetizes by titles. So I have a small notebook that lists series in order so when I relisten to a series, I can be sure which is next. When I made the list in my small book, I left one out. It took a while to figure out that I had omitted one. I was looking for a particular event in one of the books. So I finally figured out which one the event was in and checked my list. Yes, I found it.