Abraham Lincoln watched a play. James Garfield walked through a train station. William McKinley shook hands with his public. John Kennedy smiled and waved from a motorcade. In these moments shots rang out and four presidents suffered mortal wounds. Some say their assassins were calculating killers. Others say they were madmen guided by strange notions of the world. Assassins' America examines the lives of each killer and his victim. Their stories are full of twists and mysteries, and even today Americans live with lasting effects of these terrible crimes.