a city of glass-carbon towers scraping the sky, where social class is measured by the height of your floor. Yet there are still places that appear on no official map.

One of them is Station 35 – a disused branch tunnel of the old Jubilee Line, sealed after the Great Subsidence of 2087 and erased from the city’s digital memory.

But for four people, this place was home – four rejects of the system.

Arynn Halington – a hacking prodigy and cyber-modder, specializing in building nano-electronic devices from the scrap of discarded security robots. Sia Glynn – a professional parkour athlete, formerly a courier for the city’s personal air-lines; now an invisible ghost who could scale towers and slip through security gaps. Kay Morton – a sound and spatial engineer, who used acoustic-ultrasonic sensors to map places even LIDAR feared. Leah Ahmed – a cyber-medic, erased from the UK’s post-post-privatised healthcare system simply for belonging to the “Lower Ring.”

They live alongside their mentor, Merlin Grant – a man in his fifties with mechanical prosthetics and eyes that always seemed to be scanning the system for errors. Merlin was once Chief Engineer at the London Climate Management Centre, but after exposing that the elite were deliberately lowering the artificial cloud ceiling over poor districts to reduce sunlight and weaken the population, he was fired and exiled.

He always said:

“A system that cannot see us is afraid of us. Stay invisible.”