The Turing Shroud was a legendary document on an alternate Earth.
The Shroud was rumoured to be the blueprint created by Alan Turing for a universal machine. It was purported to be kept in the Tower of London, but this was a ruse to lure pro-technology protestors into being captured. Though Hannah Baxter had never seen the Shroud, she believed in its existence. (PROSE: The Domino Effect)