“Identifies the Zodiac Killer on the basis of evidence contained in the two dozens letters which the Zodiac wrote to Bay Area newspapers, letters in which he claimed to be identifying himself in some kind of code, a code which has frustrated the best efforts of the local police, the military, the FBI and the National Security Agency for almost a quarter century. The Zodiac’s ‘code’ failed to yield to the most sophisticated code-breaking technique known, and so law-enforcement authorities gave up. They didn’t try Morse Code. Using an analytical method which might have occurred to a Boy Scout, Penn produced a wealth of information which identified a particular individual. This identification has been corroborated by conventional evidence, such as contemporary photographs, handwriting comparisons, employment history, firearms registrations, and what Penn calls ‘behavioral fingerprints,’ which are documented in this book.”

Publisher: Foxglove
Paperback: 380 pages