The Book of Horror introduces you to the scariest movies ever made and examines what makes them so frightening. Horror movies have never been more critically or commercially successful, but there's only one metric that matters: are they scary? Back in the silent era, viewers thrilled at Frankenstein and Dracula. Today, the monsters may have changed, but the instinct remains the same: to seek out the unspeakable, ride the adrenaline rush and play...