Subtitles of books are interesting. In some cases they are definitely sub: they provide a second level of information about the book. Something extra. In other cases, they serve as the real title — because the main title is super clever and has great appeal . . . but it doesn’t tell you what the book is about. I wrote about these matters in a previous blog, “Nonfiction Titles: Dead Bodies at the End.”

My last two novels (Exit Velocity and The F Words) were in no need of subtitles because they...