Killer on the Road by James Ellroy

Martin Michael Plunkett is a product of his times -- the possessor of a genius intellect, a pitiless soul of brushed steel, and a heart of blackest evil. With criminal tendencies forged in the fires of L.A.'s Charles Manson hysteria, he comes to the bay city of San Francisco -- and submits to savage and terrible impulses that reveal to him his true vocation as a pure and perfect murderer. And so begins his decade of discovery and terror, as he cuts a bloody swath across the full length of a land, ingeniously exploiting and feeding upon a society's obsessions. As he maneuvers deftly through a seamy world of drugs, flesh, and perversions, the media will call him many things -- but Martin Plunkett's real name is Death. His brilliant, twisted mind is a horriying place to explore. His madness reflects a nation's own. The killer is on the road. And there's nowhere in America to hide.