Soon 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.

For decades, the Zodiac Killer has captivated America's imagination. His ability to evade capture while taunting authorities made him infamous. The vicious specificity of his crimes terrified Californians before the Manson murders and after, and shocked a culture enamored with the ideals of the dawning Age of Aquarius. To this day, his ciphers have baffled detectives and amateur sleuths, and his identity remains one of the twentieth century's great unsolved mysteries.

The Most Dangerous Animal of All reveals the name of the Zodiac for the very first time. Mustafa and Stewart construct a chilling psychological profile of Stewart's father: as a boy with disturbing fixations, a frustrated intellectual with pretensions to high culture, and an inappropriate suitor and then jilted lover unable to process his rage. At last, all the questions that have surrounded the case for almost fifty years are answered in this riveting narrative. The result is a singular work of true crime at its finest—a compelling, unbelievable true story told with the pacing of a page-turning novel—as well as a sensational and powerful memoir.

Gary Stewart

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