Piranesi lives in a labyrinthian home, where rooms are infinite, corridors are endless, the walls are lined with statues. He is joined only by a mysterious man called The Other, who visits Piranesi frequently and asks for help in researching A Great and Secret Knowledge. As Piranesi continues to explore the maze he is a part of, he begins to discover evidence that there was once someone else, and that there is a truth beyond what Piranesi has ever known.