Buying houses in cash and selling millions: meet self-publishing's 'hidden' authors

They sell millions of books, but you rarely see them in bookshops – three successful novelists on working under the radar of the book charts
Read more: https://www.theguardian.com/books/2017/jun/08/buying-houses-in-cash-and-selling-millions-meet-self-publishings-hidden-authors?source=Snapzu