Disagree with reviews of bad acting. All actors did quite well with what was given them. They had to summarize 20 years into a 90 minute movie so at least it moves fast and keeps you engaged.
Yes it may be a lesson for creeps to repeat this crime but it is also a lesson for the people living around it.
- if a daughter had a shaky relationship with her step or real father and she disappears he likely had something to do with it
- if he spends a lot of time in the basement after the disappearance, check the basement
- if you check the basement and the size does not match up with the size of the house there are likely hidden rooms
- if you're a neighbor who sees a flashlight signal coming from the basement don't knock on the door and tell the occupant, call the cops to check it out.
He may have made the basement sound proof from her and her babies screaming but I doubt that if she banged on the walls or sink that the vibrations would not be heard upstairs.