Peter Sotos' writings.
He is a true-crime writer who focuses on prostitution, drugs, broken homes, murder and rape. He is very controversial, mostly because his underground zine Pure #2 used a photocopy of CSAM as it's cover in the 1980s.
Exhausting to read, but simultaneously intriguing, horrifying and uncompromising. I read
Lazy first, which discusses the Moors murderers, child rape and prostitutes in Chicago, and AIDS swappers. His works are expensive to buy, but PDF copies of his writings are floating around.