When Albert finds a mysterious wooden box waiting for him in the driver's seat of his locked car, he has no idea that it will lead him on an extraordinary and terrifying adventure. Each clue he unravels leads only to more questions as he pieces together a map of the complex, subterranean system that lies beneath the city and the strange labyrinth hidden deep within. Can he discover the meaning behind the box? Or will the endless darkness and the things that lurk unseen within these walls swallow him forever?