TREATMENT FOR MY TRAILER

The beginning: The setting is peaceful and pleasant. It takes place in a family dining room area, where a family are sitting down, around the table and enjoying their meal together. Then they have desert afterwards, they relax for some time and the they each make their way to bed. Outside their house, on the opposite side of street, there is an evil presence lurking and watching the son as he goes upstairs to his bedroom alone.
The middle: When everyone is asleep, the evil entity seeps through the walls of the house and appears in the sons bedroom. In a flash of light from outside, the entity possess the unknowing son. Then he makes his way to the basement and walks down the creaky steps, until he reaches a plain, white wall hidden in the shadows. Then he puts his arm out in front of him thus opening up a 'Void of darkness'.
Then after this happened, a stream of creep creatures escape through the void into their house and the real world. The son starts to have a fit and the entity goes out of his body and back into the night. Then we see the mystified, bewildered and confused son go back up the steps, out of the basement, and back into his bedroom.
Then the next day plays out like a normal day and when everyone comes back home from college and work, the whole family relax and eat dinner together. Then all the lights suddenly go out and all the doors are slammed and locked suddenly (accept for 3 flashlights and the basement door is left ajar)  as it turns pitch black. Then the family have to try and survive  through the night, while trying to avoid getting killed, attacked or eaten by the creatures of the Void of nothingness.
The Ending: The son dies because the rest of the family found out that he was possessed and opened up the Void of nothingness in the basement, and the only way to close that evil Void of nothingness was to unfortunately and sadly kill the person who opened it in the first place. When they finally got all the creatures back into the void and closing it by killing their son and brother. The lights miraculously turn back on and all the doors are opened again.