Автор не определен - Venetian Carnival. A Letter from Italy

One February evening, when it is raining outside and there is nothing particularly to do, Archont Duval receives a letter from the mayor of Venice asking for his help. Just before the main event of the year, the Venetian carnival, the mayor's office receives puzzling anonymous notes. The archaeologist together with his nephew and niece must prevent a crime, the festival will take place!