I only meant to look. The pendant had a warning carved along its edge—“Reflect, and become.” My neighbour was in her flat across the hall, getting ready for bed, pausing before the mirror. When the light from her vanity caught the pendant, something folded in on itself. A heartbeat later I was staring out from her apartment, in her skin, her clothes scattered where she’d left them. My face still looked back at me from the mirror, but it sat on someone else’s body.

The pendant, my only link to reversing it, lay cracked on the floor. I could hear her voice faintly, calling from somewhere that wasn’t this world, trapped where I’d been. Outside, the sound of her husband’s keys turning in the lock snapped me to attention. I wasn’t her, not really, but the world would never know that now.