Group 72 Childrens Film Opening

Our ideas
We will be doing a live action fantasy/adventure film.
Our main characters will be a boy, girl and villain.

Plot
A boy teases a girl which causes upset between them when actually he is only teasing her because he doesn't know how to act around her and does in fact fancy her. The girl finds a precious and mysterious item on the floor which he notices and steals from her which teleports them both to a secret realm. The audience are there to think that the boy is the baddy but as the story goes on another child is revealed to be the real villain who follows them into the secret realm; later we find out this child is actually some sort of evil monster in disguise.