Studio 360 visits the underworld. In the new horror movie, “Jennifer’s Body,” a high school alpha female is possessed by a man-eating demon; screenwriter Diablo Cody explains why she wrote the story. The novelist James Ellroy imagines political conspiracies and covert crimes in his new novel about the 1960s, Blood’s a Rover. And one of our listeners gets a sad lesson in life from REM’s Automatic for the People.