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.
A nice copy of this paperback: some page toning, but the spine is very straight, edgewear very mild.