What Makes An eBook A Best Seller

What Makes An eBook A Best Seller
FILE- This file combo made of book cover images provided by Vintage Books shows the "Fifty Shades of Grey" trilogy by best-selling author E L James. While it's impossible to declare a Fifty Shades of Grey baby boomlet, some moms and moms-to-be attribute their pregnancies to sex inspired by the erotic trilogy that went mainstream early this year.(AP Photo/Vintage Books, File)
FILE- This file combo made of book cover images provided by Vintage Books shows the "Fifty Shades of Grey" trilogy by best-selling author E L James. While it's impossible to declare a Fifty Shades of Grey baby boomlet, some moms and moms-to-be attribute their pregnancies to sex inspired by the erotic trilogy that went mainstream early this year.(AP Photo/Vintage Books, File)

When you're curled up with a good book that you just can't set aside, whether it's a physical book or an ebook, do you know what makes it so compelling? Is it the mystery, the suspense? Maybe it's the romance.

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