You wake up to the sensation that there is something wrong in the room.
The darkness is thick, almost palpable. Your hand slides to the nightstand, looking for your phone, but stumbles over the remote. A blind click and the TV screen flashes, flooding the room with dead blue light. On the screen is the news. The announcer, with a lifeless smile, says:

...Two more victims. As in previous cases, they heard a violin before they died. Eyewitnesses describe the killer: tall, in black, with a mask on his face. But the strangest thing is. "

The voice is interrupted. The image jerks, like the signal's picking up interference. For a second the screen goes out - and when it flashes again, it is no longer the announcer, but a figure in black, standing with his back........ The violin isn't playing from the TV. It comes from behind your door. Slowly. Solemnly. You don't breathe.
And then... the doorknob starts to turn.