Carl Denaro lives with a metal plate in the back of his head, a macabre memento, police say, from “Son of Sam” serial killer David Berkowitz. Berkowitz terrified the Big Apple in 1976 and 1977 in a sadistic shooting spree that claimed six lives and critically wounded seven others. The schlubby civil servant confessed to pulling the trigger of his .44-caliber Bulldog revolver on the orders of a demonic dog. However, Denaro claims in a new book — co-authored with Brian Whitney — that his shooter was not the “Son of Sam,” but a mysterious “occult priestess” named “Big Breasted...