When American tourist, Mark Buzzard, takes a trip after dusk to London’s Highgate Cemetery, he never could have imagined meeting the woman of his dreams; Wren, a beautiful girl in a long, brown Victorian dress. Their encounter in the cemetery that night changes both of their lives, as gentle Wren takes him underground, riding the rails to a subterranean city, beneath London’s St Paul’s Cathedral.
Designed by Christopher Wren, he created Sous Llydum to accommodate the homeless following the Great Fire of London of 1666. Still in existence today, the city is London’s best kept secret.
Without the trappings of the world above, the people of Sous Llyndum lead the way in modern society, as they live by their own values and traditions. Compared to the world above, Sous Llyndum is less corrupt, rich with innovations, and holds a wealth so vast, it could boost the country’s economy.
Newly elected Tory Prime Minister, Alice Burton, enforces plans to take the city back under the control of the government, so that they may build downward to provide unique housing for the rich. No one, except Colonel Geoffrey Barnes knows that she has other rewards in mind; to take the minerals from under their city, to help solve Britain and America’s economic crisis.
While Ben Mason opposes the scheme, his estranged wife, Charlotte Croft, a columnist for The City Limits newspaper, helps Mark Buzzard and the princess Wren to thwart the government’s plans.
Byron the Bird Catcher, the king’s second in command, keeps close guard over the upsiders, while she shows them everything the city has to offer; a veritable feast of wealth and unique industry, including a mineral which could illuminate London for the next hundred years.
As the struggle to gain the city increases, the colonel takes matters into his own hands, as he instigates a plan to destroy the people of Sous Llyndum and to open up the city to the world above.