James Ellroy 
Blood On The Moon [EPUB ebook] 

The first installment of the Lloyd Hopkins Trilogy. Somewhere out there is a murderer with over twenty killings to his name — each an apparently random slaying of a woman, over a twenty-year period and all unconnnected on the police files.But Detective Sergeant Lloyd Hopkins begins to see a pattern: he senses connections between this string of seemingly motiveless, pointless and unsolved killings. Then the murderer emerges not as a random killer, but a cool, efficient despatcher — in his own eyes a saver of souls and protector of the innocent.As they are drawn inexorably together, Hopkins and the murderer challenge each other in a confrontation which pits icy intelligence against white-heated madness…