Imagine an old, dusty room, with furniture covered in white sheets

Imagine an old, dusty room, with furniture covered in white sheets. No centro do quarto, there's a large mirror, with an ornate frame that seems to have been made centuries ago. The only source of light is a dim candle, who casts disturbing shadows on the walls and the mirror. As the candle flame flickers, the reflection in the mirror seems to distort and move in a strange way, as if something invisible was trying to get out of it. Every time you turn, the mirror seems to reflect a dark, indistinct figure that isn't actually present in the room. The sound of light, soft footsteps can be heard, as if someone was walking behind you, But when you look, the room remains empty.