By James Alan Fox and Jack Levin. An attempt to explain/extrapolate from the usual suspects -- Dahmer; Gacy -- all in one convenient paperback.
Said PB was either quite well loved or sent partway through a laundry press...guess it could be both. In addition to edgewear and page toning, it has a hump of sorts (see pic). In any event, this two-bucks-and-chuck is a decent insight into how this horrendous breed of monster was reported on and marketed in the mid-1990s.