The Zodiac Killer murdered five people between December of 1968 and October of 1969. The murders were followed by letters to the news media demanding publication of his threats and other written material, on pain of further killings. As the Unabomber, Theodore Kaczynski murdered three people and injured many more, over a period beginning in May of 1978 and continuing through April of 1995. His murders were followed by letters to the news media demanding publication of the letters themselves, and the so-called "Manifesto," on pain of further killings. Their methods were different, but their madness was the same. This book highlights the amazing similarities between Kaczynski and the Zodiac, the two most enigmatic and cerebral killers in U.S. history.