In The Devil's Best Trick, Randall Sullivan investigates historical, religious and cultural conceptions of evil, from Biblical times to European witch hunts to the devil-worshipping 'Black Mass' ceremony. He travels to Mexico to participate in the 'Hour of the Witches' - an annual ceremony in which hundreds of people congregate in the jungle south of Vera Cruz to negotiate terms with El Diablo. He takes us through the most famous exorcism in American history. And he delivers original reporting on the shocking story of a small town in Texas that, in 1988, unravelled into paranoia and panic after a seventeen-year-old boy was found hanging from a tree and rumours about Satanic worship and cults flourished.