Some things should be kept to yourself . . .
  1. In Deep Voodoo (Mojo, Louisiana humorous mystery series)
    Perfect to power through on a 3 hour flight, but the title is really just terrible. I would not read a physical copy of this book in public.
  2. Inescapable
    And the other 3 books in the Premonition Series (Intuition, Indebted, and Incendiary). Imitation Twilight YA but with angels. My friend who also has terrible taste in books has dubbed these books the Angel Sex series.
  3. 50 Shades series
    You don't want to make eye contact with anyone on the train if you're carrying a physical copy of any of these.