An exhaustive analysis of the "Zodiac Killer" letters of 1969 reveals the shocking truth that they were a cruel hoax intended to terrorize the public with a fictitious "deranged killer" who took "credit" for the otherwise unrelated murders of five young people in the San Francisco Bay area. The letters are compared, sentence by sentence, with the actual evidence in each crime, which reveals not only that the letters were a hoax, but also reveals the exact sources of the hoaxer's information. This research also reveals, for the first time, that two infamous phone calls from the supposed "Zodiac Killer" were also hoaxes.
This version of the book is heavily redacted. I read the unredacted version - The Myth of the Zodiac Killer: a literary investigation.
This presents a thoughtful analysis of the media relationship with the Zodiac phenomenon and does a good job of placing it in the context of the historic trends in newspaper narrative, politics & coverage during the period of the murders.
Better still, it casts a skeptical, critic's eye on the wide swaths of Zodiac lore that are typically taken as a given. He Zodiac narrative has always seemed suspiciously perfect in a made-to-order for media coverage sense. The book is fairly effective at calling into question some of the lynchpins of the narrative. In the process, the larger-than-life mythology of the narrative is significantly deflated.
Mr Horan does a good job citing facts and figures of the case files and puts forth a fairly good "educated guess" as to true zodiac origins. He uses hard facts. But even then, he doesn't state for 100% certainty the "zodiac's" true written or physical composition.
For anyone who bought this Kindle book before May, 2015: If you go to Amazon.com, you can download the massively updated, unredacted, complete, up-to-date 2nd edition FOR FREE. Sorry it took so long ;-)