Book excerpt: Robert Keppel explores in unflinching detail the monstrous patterns, sadistic compulsions, and depraved motives of serial killers. From the Lonely Hearts Killer who hunted the most desperate of women in 1950s America to such infamous symbols of evil as Jeffrey Dahmer, Ted Bundy, and John Gacy, these are the cases--horrifying, graphic and unforgettable--that Keppel ingeniously taps to shed light on the darkest corners of the pathological mind. Foreword by Ann Rule.