An explosive and historic New York Times bestseller of true crime and an emotionally powerful and revelatory memoir of a man whose ten-year search for his biological father leads to a chilling discovery: His father is one of the most notorious-and still at large-serial killers in America--THE BASIS FOR A 4-PART FX DOCUMENTARY MINISERIES.

"I promise that you've never read anything like The Most Dangerous Animal of All. Mesmerizing from the first page, the story includes a shattering surprise that will sear itself in your memory. Be prepared to read non-stop; this really is a book you won't be able to put down." --Jeff Guinn, author of Manson: The Life and Times of Charles Manson

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. It was a quest that 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 D. Mustafa, The Most Dangerous Animal of All tells the story of Stewart's decade-long hunt for his father following a complex trail of startling twists and connections. Combing through government records and news reports and through conversations with his father's relatives and friends, Stewart turns up a host of clues, including forensic evidence, identifying his father as one of the most infamous and still-wanted serial killers in American history.