Some doors are not meant to be found.
Others are not meant to be closed.

BLACK DOOR OPERATIONS is a classified field manual documenting the world's most dangerous thresholds - doors, corridors, rooms, and passageways that breach reality itself.

Recovered from sealed archives and suppressed reports, this volume details covert investigations into impossible architecture: elevators that stop on floors that don't exist, mirrors that move before you do, apartments that open into other lives, and corridors that remember who walked through them last.

Each case file includes operational breakdowns, hazard assessments, and containment protocols written by the agents who survived - and sometimes by those who didn't.

These are not myths.
They are not urban legends.
They are active sites.

And once a door opens, something always notices.