This is a "description page."
Here the student finds the missing piece to the puzzle. Bear in mind that the strange person or dog is still downstairs. This would be a good place for a "tension piece." Students could describe the agonizing wait, caution not to make too much sound, listening and watching.
You see a trap door far off in the corner. Carefully you open it and find a long staircase. It seems to go straight to the basement. There is only a small window for light. You stop and listen. All is quiet. It seems safe to go back down to the library again.

 
go down into the basement
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