90’s mystery boy and girl solve missing girl case in treehouse

A young boy and girl have a treehouse (that possibly is going to be torn down) and they witness a teen boy dig up a bag in the woods, making them believe the teen has murdered a missing girl (who was his girlfriend). There’s a scene where the young girl is in the missing girl’s room and notices all of the pictures of the girls boyfriend were damaged, and also something under the bed (I think the young girl has to sneak out of the window) The boy and girl sneak into the back of the boyfriends jeep and they drive to a restaurant in another town to find that she’s alive and a waitress while playing music on the side. I believe the movie ends with the missing teen’s whole family along with the boyfriend, boy and girl, at the restaurant watching her sing?

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