When I was young around (1998-2004) I saw this movie with my mother. All I can remember was a woman attempting to solve these child murders in her town. At the end, they find the killer and he is either killed or finally brought to justice. I believe the children were killed and buried in some type of cave. The women who helped solved it is then seen standing and you can hear the laughter of the children as their souls are finally able to rest. Can someone help me out?