Intrigue becomes labyrinthine in this volume. At one point, the narrator acknowledges that we've had by now "layers and layers of explanation" (149). Agreed. It's cool, though, that he likewise understands "the city of facts I was slowly erecting on the grave of my other self," and that "each wave of interpretation that broke upon me shifted the position of one or more things" (id.). These may well be the key passages of the entire serial.
All that said, it's kinda tedious, with a barely predictable last-page unmasking that works into an otherwise inexplicable title.