I found this an enjoyable mini history of some of the world's cold-blooded killers, (I won't waffle about the errors), I found it an enjoyable in that the stories were generally short enough that I was able to read the whole write-up on a person when I had a spare five minutes.
The book is broken down into seven sections which if you study history and/or read a fair amount of true crime you could guess at some of the persons that would be included (Hitler, Stalin, etc).
PART ONE: ANCIENT MURDERERS - includes the histories of Attila the Hun, Genghis Khan, Vlad the Impaler,
PART TWO: TYRANTS AND DESPOTS - Mao Zedong, Augusto Pinochet, Ho Chi Minh, `Tito'
PART THREE: COLD-BLOODED WOMEN - Elizabeth Bathory, Lizzie Borden,
PART FOUR: VICTIMS OF ASSASSINATION - Abraham Lincoln, John Lennon, Jill Dando,
PART FIVE: ATROCITIES - The Rape of Nanking, Genocide in Rwanda,
PART SIX: ORGANISATIONS - The Mafia, The Yakuza, The Triads and The Baybasin Cartel.
PART SEVEN: COLD-BLOODED MEN - Richard Kulinski the Mafia Iceman, Bianchi and Buono the Hillside Stranglers and Kenneth Allen McDuff: The Broomstick Killer.
All in all, there are about 60 or so people included in this book and I think I recognized about 60-70 percent of the names but that is mostly thanks to my True Crime magazines and history studies at school.
For the ardent true crime/history buff this most likely will disappoint and I doubt that it would provide any new information, but I think casual fans like myself might enjoy it. Fortunately Amazon provides the "look inside" option on this book and I would recommend you use this - that way you can see the full list of persons featured in each Part - and thus see if there is anyone you haven't heard much about, as well as read the first story or two to see if you like the style and the information it provides.
Hope this helps.