I heard about this on the radio yesterday coming to work, but only briefly.
But today I got a chance to read a full article and I must say, this is like something out of a horror film.
A guy by the name of Josef Fritzl trapped his daughter who was 18 in his basement of the house he and his wife lived in since 1984 , where he repeated to abuse her until he was discovered recently. He even had 7 children through her. One died at birth, where he burned it, three remained with the mother and the other three he and his wife adopted. The three children in the basement have never seen daylight until now and the effects of this mean they will never have a normal life now. The only reason he was discovered was because one of the children became very ill and needed to be brought to hospital, and the lack of medical history alerted people to something suspicious and thus a chain of events resulted in the daughter being found and released.