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A New York Times BestsellerA San Francisco Chronicle BestsellerSoon after his birthmother contacted him for the first time at the age of thirty-nine, adoptee Gary L. Stewart decided to search for his biological father. His quest would lead him to a horrifying truth and force him to reconsider everything he thought he knew about himself and his world.Written with award-winning author and journalist Susan Mustafa, The Most Dangerous Animal of All tells the story of Stewart's decade-long hunt. While combing through government records and news reports and tracking down relatives and friends, Stewart turns up a host of clues - including forensic evidence - that conclusively identify his father as the Zodiac Killer, one of the most notorious and elusive serial murderers in history.