I would just like to point out that despite how the paperback appears on Amazon.com, it is not, in fact, unusually tall and narrow for a novel. There’s a white margin, as the borders around the image in the previous entry indicate. The book is dimensionally proportionate, novel-wise.
Update: I just noticed that when you hover over the link below and the little Snap Shots popup of the Amazon page appears [a dubious feature I may remove soon], there is a border around the cover image. Go figure.