Nemesis
Context: Petronius once told me that pathological murderers tend to start their killing sprees while they are children. Find a man who takes prostitutes off the streets as a personal vocation, and he'll probably have a set of neat jars with his childhood collection of dissected rats.
Quotes from book
Nemesis

Nemesis is a 2009 historical mystery crime novel by Lindsey Davis and the 20th book of the Marcus Didius Falco Mysteries series. Set in Latium during AD 77, the novel stars Marcus Didius Falco, informer and imperial agent. In Ancient Greece and Rome, Nemesis was the spirit of divine retribution against those who had succumbed to hubris . In the book, Falco is warned by Anacrites, the Imperial Chief Spy, to be wary of Nemesis following Falco's inheritance of his father's sizable fortune, while the Claudii, the novel's primary antagonists who meet unpleasant endings, are revealed to have fallen afoul of their own hubris.
Lindsey Davis
book
Nemesis