Al Cimino is the author of over 100 books including The History of the Mafia, House of Horrors, Killers-the Most Barbaric Murderers of Our Time, The World's Ten Most Evil Men, Underbelly UK: Vigilantes, Australian True Crime, The World's Most Evil Gangsters, Lone Gunmen, Against Their Will, The Mafia Files, The Murder of Tina Sharp, The Cleveland Kidnappings and The Disappeared. This edition also includes contributions from Charlotte Greig, author of Evil Serial Killers; John Marlowe, author of The World's Most Evil Psychopaths and Paul Roland, author of The Crimes of Jack the Ripper and In the Minds of Murderers.