James Ellroy 
Because the Night [EPUB ebook] 

The second installment of the Lloyd Hopkins Trilogy. As Detective Sergeant Lloyd Hopkins pieces the puzzle together he discovers the darker threat of John Havilland, a psychiatrist whose pleasure comes from the manipulation of the weak and the lonely …And, as Hopkins closes in, Havilland’s madness rages uncontrolled — and forces a shattering confrontation with the darker side of the human mind.