She then headed downwards, following the gradually descending slope of the narrow street for lack of any better idea. She kept her arms and legs pumping furiously, ignoring the faces that sometimes loomed out of the dim light of successive tunnels and passageways, at first looking curious, then terrified as they glanced behind her. She didn’t need a backward glance to know the burning man was still on her trail. Although the detonation hadn’t physically harmed her, her clothes – unprotected by her filmsuit – were smoking and burning.

The street veered sharply to the right, and she threw herself around the corner, then ducked into one of the first doorways she saw. Maybe she could lose herself.

She found herself at the top of a steep and narrow stairwell, and followed it down to yet another vaulted passageway with bridges arching overhead. Taking several side entrances led her further downwards, as she ran on in her search for a suitable place to hide.

Something now rumbled from deep within the rock, growing louder the deeper she went. She soon found herself in a confined space whose roof was so low she had to almost bend double to make her way across it. Dakota realized she was now truly lost, and had to fight back her panic. She tried to connect with Derinkuyu’s open access networks through her implants, but they responded with error messages that were not evident when she had met with Rivers earlier.

It had to be because of Moss. Somehow he had known she was here in the system, so he had engineered a crash in the networks servicing the local population.

Passing through a door on the other side of the cramped space, she suddenly found herself entering a vast, cavernlike area almost as extensive as the one she had first encountered Rivers in. But this one seemed empty of residents, and the air was filled with a heavy, thundering roar that suggested a subterranean cataract.

High up above her extended a curving ceiling painted in rich dark colours, adorned with a swirl of stars and shapes that gradually revealed themselves as a depiction of coreships and planets: a giant tableau that appeared to depict the earliest years of Derinkuyu’s human settlement.

Across the huge chamber, a waterfall gushed out of one stony wall, spilling a dozen metres into a subterranean lake stirred up by a whirlpool several metres across. A dozen metal walkways, at different heights and interconnected by ladders, were suspended by cables from the ceiling. They crossed from one side of the cavern to the other and, even from where she stood, Dakota could see they gave access to yet more passageways all around.

The entrance to one such walkway was right in front of her, and in the centre of it stood Hugh Moss, with an insane grin spread across his calloused features.