There is nothing behind that door just a wall of bricks
I have to see what is behind this door.
This is Coraline, she and her family just moved to a new weird house.
She was exploring the house and found a strange locked door in the drawing room, she asked her mother what was that door.
She went back home and her parents where there and she was happy
She went to bed, but in the middle of the night heard weird voices. The sound was coming from the drawing room, when she got there the locked door from before was open and there were no bricks.
At the end of the long corridor there was a house exactly like her with her parents but with buttons in their eyes, she was scared so she came back to her normal house , and her parents were not there.
So she went back and discovered her other mother took them, she needed collect all the souls to get her parents back. The souls are little shining marbles. She found all of the souls and went running to her other mother to get her normal parents back.
She went back to where her fake parents were and showed them all of the marbles, her fake mother was not going to give her parents back so coraline trew a cat in her face that made the key from the door fall on the floor, caraline went fast and closed the door really hard leaving her fake parents behind.