The Darkness is good

I entered to the room, the first thing that I noticed was that the room was empty. I looked around to see the door were I entered but it was gone I kept looking around, trying to see a door or a window, but all I could see were the white walls that surrounded me.
I started screaming, with hope that someone heard me, but I realized that I couldn't hear my voice, the only thing that I heard was a "pum, pum, pum" it sounded like a drum.
I followed the sound, it lead me to the wall in front of me.
I stare at it a while, until the sound went faster and faster.
I tried to get away of it, but I couldn't, something behind the wall was trying to find me.