Do Not Ever Open

The moment Karen touches the unmarked envelope, the air in her apartment shifts. A low hum vibrates through the walls, and the photographs on her shelf begin to slide, as if pulled by an invisible hand. The lights flicker erratically, casting dancing shadows that don't match the objects around them. Before she can react, the furniture rearranges itself with a violent screech, and the clock on the wall spins backward. Karen stands frozen, heart pounding, as her once-familiar home transforms into a stage for something entirely beyond reason.