A German-born woman works as a spy for the French in Switzerland during the First World War, and has to marry an interned French lieutenant in order to be able to stay in the country.
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...
A detective is on the verge of revealing the identity of an elusive criminal. At the crucial moment, hedrops dead, the victim of foul play. A revolutionary electric devise is utilized to bring the detective back to life long enough for the successful completion of his mission.