Most dangerous animal of all: searching for my father and finding the Zodiac killer. Gary Stewart & Susan Mustafa. 2014.

Written with award-winning author and journalist Susan Mustafa, The Most Dangerous Animal of All tells the story of Gary Stewart’s decade-long hunt for his father, following a complex trail of startling twists and connections. 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 killers in American history.