Slippery Rodney Haines runs a high-class gambling joint in Hampstead, while elsewhere in London Lamberti's Fair for the less-well-off is on its last legs. The only link between them seems to be Tommy Blyth, whose betting has put him in serious debt with Haines and who fancies Mary, the Lamberti's adopted daughter. In fact, there is a further unexpected link between the two worlds.
In the 15th Century, France is a defeated and ruined nation after the One Hundred Years War against England. The fourteen-year-old farm girl Joan of Arc claims to hear voices from Heaven asking her to lead God's Army against Orleans and crowning the weak Dauphin Charles VII as King of France. Joan gathers the people with her faith, forms an army, and conquers Orleans.
A choirmaster addicted to opium and obsessed with a beautiful young woman will stop at nothing to possess her.