Here are a few recommendations for books.. not sure that all these authors have other true crime novels, but some excellent books nonetheless:
- Harold Schechter. I read The Devil's Gentleman, which was very good. He has many other books, though I haven't read any others.
- For the Thrill of It by Simon Baatz, about the infamous Leopold and Loeb murder.
- Satan's Circus by Mike Dash. It probaby doesn't fit the traditional "true crime" genre, but it is pretty close.
- The Killer of Little Shepherds by Douglas Starr.
- The Murder of the Century by Paul Collins
I will say, I tend to enjoy the late 19th / early 20th century as a time period, so most of the above books are from crimes around that era. Sort of real life gothic / victorian crimes.