How Are "Mein Kampf" E-Book Sales Doing?

I saw a woman reading Mein Kampf on the subway this morning. The cover was on it, she hadn’t ripped it off, or covered it with a brown paper bag or anything. She did tuck it face-inward when she closed it to get off at her stop, but that could have been unintentional. But it made me wonder: if e-book sales of romance novels are big because, as genre expert Sarah Wendell told the Times last week, the print editions “are not always something that you are comfortable holding in your hand in public,” how does Mein Kampf do in that regard? Well, it turns out. March of last year, it topped Amazon’s Kindle Book Mystery & Thrillers sales chart.