well this is an intriguing book which talks about how Gary found out that his biological father is no other The Zodiac Killer who terrorized America iwell this is an intriguing book which talks about how Gary found out that his biological father is no other The Zodiac Killer who terrorized America in the late 60's and was never apprehended, read the book to get the full details and how and why they reached this conclusion.
ps: thank god that my biological father is only a sadistic MF in finance and not anything else lol