I take public transport quite a bit, and I read a lot on it, too. While I don't mind being asked what book I'm reading, other people might. I'm always on the lookout for new authors, but I know

• some people might not want to be bothered
• some people might feel patronized if they ask back and I am reading a tougher book than they are (I often read tough books on the train because there are no computer distractions at home)

Just trying to look at the book to catch the title/name is, of course, awkward in its own way. Potentially staring at people is not cool.

But this seems like something I shouldn't overthink.

I want to know the title and author, but I do not want to be seen as obtrude or stalker.

Question: How to ask - polite and not disruptive - which title the person in front of me is reading?