An assignment brings Vincent Reynolds, permanent student and budding young writer of 'New London Journalism', into the world of Sebastian Wells, charming and manipulative scion of an aristocratic London family. This unlikely friendship draws our working-class hero into contact with the Prometheus League. Under the guise of a Victorian gaming society it operates extremist and covert activities of a sinister nature.

When Vincent threatens to expose Sebastian, he is suddenly thrown into a game for life or death: ten deadly challenges, questions that lead him and a motley crew of insomniacs, misfits and street people on a wild goose chase through the sleeping giant of London town, from dusk to dawn...