important questions
If the girl laying down at the end is the teachers daughter, then who kidnapped the cops daughter? And why would he do that to his own daughter? That doesn't mean he's the killer of the other girls...
If the girl is the cops daughter, then does that mean the teacher kidnapped her for one time revenge or that that the teacher was the killer the whole time?
If he had a secret wall it sounds like he could have been the killer the whole time and just with the cops daughter.