Stewart, a vice-president at Delta Tech Service in Baton Rouge, alleges that his father was the Zodiac Killer, who is believed to have killed at least five people in Northern California, and famously sent letters and cryptograms to Bay Area newspapers.
He reached this conclusion after twelve years of research, Tina Andreadis, a publicist at HarperCollins, told me this afternoon.
HarperCollins is a legitimate, if sensationalistic, publisher—it was the intended original home of O.J. Simpson's pseudo-confession If I Did It. Its employees have apparently been very careful to keep word of the premise of the book, called The Most Dangerous Animal of All, a secret.
The infamous Zodiac Killer case involves a string of murders in northern California that began in the late 1960s, though this won't be the first time that someone has claimed to have solved the mystery.