Tremors in the BloodHenry Wilkens burst through the doors of the emergency room covered in his wifes blood. But was he a grieving husband, or a ruthless killer whod conspired with bandits to have her murdered? To find out, the San Francisco police turned to technology, and a new machine that had just been invented in Berkeley by a rookie detective, a visionary police chief, and a teenage magician with a showmans touch. John Larson, Gus Vollmer and Leonarde Keeler hoped