A psychiatric-clinic medical director runs some tests on two patients, the Ragionier Antonio Vignanelli and Cavalier Peppino Caprioli, so they must retrieve some memories of family life in order to understand their mental illness.
Maruzzella is in love with Salvatore, who in turn is infatuated with Donna Carmela, Maruzzella's stepmother. As if that were not enough, Carmela deprives Maruzzella of her inheritance. When Salvatore comes to visit Renato, his old poor and needy schoolmate, the situation takes a strange development.
A simple barberman from Naples travel to Arabia for search a big fortune that could make him rich.
