POV iPhone: a cheerful real estate agent walks down a concrete stairwell, smiling at camera. "And this is the basement level, perfect for a wine cellar or home gym!" She descends past landing 1, landing 2, landing 3. Her smile falters. "Okay, the developer mentioned something about extra storage..." Landing 12. Landing 23. Landing 40. She's no longer smiling. The flashlight on her phone illumin...
