The Key Hole

A girl named Arianna, goes exploring in her big uncle's house and surprisingly, finds that there are secret pieces of paper hidden all around the house. They tell her where to go to find a key that opens a secret door.

What will the key unlock?

Will it unleash a dangerous monster that is a blood thirsty animal or will it a teenage boy or both?

Will it lead her to another world or perhaps the past? Or future?