Jon stood before a door in the bowels of a mammoth edifice, one with high vaulted ceilings, ornate staircases and thousands of doors and rooms, many stories tall and deep. He had been here so many times before it remained etched into his memory, even when awake.

He’d been having this same dream, or one very similar, for as long as he could remember. It always ended the same, standing in front of a door in abject terror as the door opened, and then…

He’d find himself awake, heart pounding, swe...