Eugene, a young nobleman, asks two penniless idlers to impersonate his noble relatives to help him marry Gemma, the daughter of an enriched cook.
Based on real events, in Rome a lawyer is not sure whether to accept defending a lower-class worker wrongly accused of the murder of his girlfriend.
Italian naval secret agents acquire a British codebook and the Italian counter-espionage agents start tracking enemy agents working undercover in Italy and providing false information.
