The kidnapping of a Viennese banker and his daughter threatens to trigger a diplomatic scandal, which could result in the entry of Austrian armies into the country. Margelatu thwarts this attempt and clears up the story.
Agatha Slatineanu, together with the alleged banker Troianoff, rob the boyar Valcu of a treasure collected in order to buy the throne. However, the gold is recovered by Margelatu for the benefit of the "Brotherhood".
Margelatu discovers and annihilates a plot by the Austrians by infiltrating the Fratia organization with a fake envoy of the French revolutionary Alphonse de Lamartine
