It was the case of Josef Fritzl, an Austrian man who had kept his daughter as a sex slave in a basement dungeon of their home for 24 years. The premeditation was as dastardly as the act itself. Fritzl had begun fashioning the secret dungeon, about which his wife knew nothing, into the prison four years before locking his daughter Elisabeth in there. Then, in 1984, he tricked the then 18-year-old Elisabeth into going into the dungeon with him. Once she was inside and drugged, he shut the sound-proof door behind her. He made his wife believe that the young woman had run away to join a cult and the mother believed the lie for 24 years.