User blog comment:Master Sima Yi/Assassinews 03-12-'14 — New Assassin's Creed in Victorian London leaked/@comment-24159499-20150127045820/@comment-3046679-20150130141801

Check the Anvil (game engine) page.

Also, "keeps" having traitors? We've had only Walpole that was a British turncoat so far.