By Harold Schechter. I always 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 in pretty good shape: a ding to the top of the front cover; edgewear elsewhere; toned pages. But it's nice and straight, the pages are tight, and the spine's not cracked -- atypical of Schechters in PB.