For fans of true crime, this fourth entry in the Profiles in Crime series presents history’s most “elite” serial killers—master murderers who stretched the psychic envelope and racked up the largest number of victims.   Historical in scope and international in breadth, this collection of true-crime stories chronicles 15 of the most infamous “extreme killers” who ever lived—those with the largest number of confirmed kills, in many cases more than 50. The subjects range from 1