Ted Bundy. John Wayne Gacy. Jeffrey Dahmer. The names of notorious serial killers are usually well-known; they echo in the news and in public consciousness. But most people have never heard of Israel Keyes, one of the most ambitious and terrifying serial killers in modern history. The FBI considered his behavior unprecedented. Described by a prosecutor as ''a force of pure evil,'' Keyes was a predator who struck all over the United States. He buried ''kill kits''--cash, weapons, and body-disposal tools--in remote locations across the country. Over the course of fourteen years, Keyes would fly to a city, rent a car, and drive thousands of miles in order to use his kits. He would break into a stranger's house, abduct his victims in broad daylight, and kill and dispose of them in mere hours. And then he would return home to Alaska, resuming life as a quiet, reliable construction worker devoted to his only daughter.