Zodiac Maniac: The Secret History of the Zodiac Killer

In 2011, as author Glenn Wall began research on what became a book on the Valerie Percy murder case (Kenilworth, Illinois, 1966), he was unaware that there was a previously unnamed criminal whom the FBI considered to be a prime suspect for the murder. However, he did learn that police couldn't make anything of one piece of evidence found at the crime scene nor of two other area crime scenes whose crimes were linked to the murder. It was odd, they said. He took their word for it, and it didn...