Father held his daughter prisoner for 24 years

The door was hidden by a tool rack, and pretty small so if you didn't know where to look you wouldn't have found it. Even so, either the woman knew about it and is in denial, or she's seriously retarded. Just the fact that she hadn't seen her daughter for 24 years while her husband didn't seem to worry so much should have been a hint to what could have been going on. Belgian newspapers reported today that they suspect there may be other men involved, they are testing the paternity of the children, and they also can't see the guy pulling a stunt like this off alone (he went on holiday for a couple of weeks, so someone had to look after the girl).

rocketdog:
The man "adopted" his incest daughters, and when one of them got sick, they needed a family history to diagnose her. The police searched for the woman, who was presumably missing, until they eventually discovered the cellar.

Jam it back in, in the dark.