Cecilia, who we already met in “La Cartolina di Elena,” arrives in Rome to celebrate her friend David's Bar Mitzvah, the Jewish ceremony that marks the transition to adulthood. The two kids discover a mysterious gold ring and thus learn the story of Giacomo Moscati, who, as a teenager during the occupation of 1943, experienced the “gold blackmail” imposed by the Nazis on Roman Jews and the roundup of the ghetto