By Harold Schechter. I sometimes forget Schechter is (as of this writing, anyway) an emeritus professor; it's historically been easy to dismiss his work as mass-market garbage because the early stuff was focused on ghoulish cases -- like this one, his second, about Ed Gein. This one isn't great on the prose level but Schechter does the work.
This paperback is one of the newer, larger-format editions; some visible shelfwear, toned pages, a sticker on the back and a remainder mark along the bottom, but an uncracked spine, no writing or dog-ears. A solid reading copy.