I am 64 years old, finally retired and trying to make up for my misspent youth. Now I want to make every day count—it is not primarily about having fun, unless you count studying (languages) and (athletic) training fun. I was concerned that after many years of finding nothing good to read, books could no longer hold my interest. To my relief, I have found that this is not completely true. However, the authors that can still keep me engaged write crime fiction. Besides simple diversion, how can I justify this use of my time? I can pretty much spot the plot devices and tropes.