The gates of Hell are unlocked to reveal the surprising truths and devilish secrets of Satan, demons, and other powerful rulers of the Underworld. In the 17th century, a beastly devil is born deep in the woods of New Jersey and is said to still wreak havoc in a place called the Pine Barrens. Plus, from evil Jinn, whose power a nuclear physicist tried to tap, to a Christmas devil that takes naughty kids to Hell, to a two-faced female demon named Hel who presided over the dead in the icy North, there's a lot to learn about our devils and the history that inspired them.