This is a "description page." In this case the teacher would insert the students' description of the closet. It too could be based on spooky examples from text and incorporate vocabulary words that are connected with the closet.
I use many closets in this mystery and this one in particular happens to have a secret door. I would imagine that secret doors would be irresistible to anyone on a treasure hunt so they would be serve as good incentive anywhere to lead the student to the right track.
This particular secret door leads into the library.

 
enter the library
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