11 year old William is desperate for an adventure like the kind he sees in the movies. When he discovers a dull grey metal box under a hedge in his yard he opens it to reveal the first of a tangle of mysteries that leads him to a secret room behind the movie screen in the old theater. With the help of his best friend Marie, he slowly begins to piece together why there is a lone cornstalk growing in his neighbors back yard, why its surrounded by lanterns, and why someone is out to get their hands on the box and its contents. It's up to William and Marie to investigate the clues as they try to sort out why the box was under the hedge. Will they be able to figure it all out before it's too late? The "Pop-ulation" of Stock om is in desperate need of the brave duo. Trouble is, no one knows it yet.