The deep overlay was different from the sections the raid teams had been working in. The raid operations had covered the outer and middle sections of the inverted space, the incorporated streets closest to the original Fracture sites, the areas where the dimensional bleed had overwritten the city's surface while leaving enough of the underlying geography intact to navigate by. Streets were still streets in those sections, buildings still buildings, the wrongness layered on top of a recognisable structure. The deep overlay had no recognisable structure. Four weeks of inversion had done something to the central zone, the area equidistant from all four original Fracture sites, the overlap point where the four bleeds had met and merged. The city architecture was gone here, not incorporated,

