Is anyone familiar with Robert Graysmith's books on the Zodiac Killer? The Fincher film "Zodiac" is based on Graysmith's research/obsession. I don't think the f

Is anyone familiar with Robert Graysmith's books on the Zodiac Killer? The Fincher film "Zodiac" is based on Graysmith's research/obsession. I don't think the film mentions anyone named Poste at all. I'm wondering if he ever came across Graysmith's radar.