Former Playboy twins expose dark reality behind mansion's glamorous facade

For four years, former Playboy playmates - and twins - Karissa and Kristina Shannon were thought to have been living a life of luxury and glamour inside the Playboy mansion with boyfriend Hugh Hefner. But behind closed doors, the Florida natives were fighting to survive a web of trauma-filled experiences ignited by jealousy and betrayal. 

Coming from "humble beginnings," the twins, now 35, were first discovered when they were just 16 years old. Two years later, they moved into the mansion...