Hercules decides to avenge the death of his wife, murdered at the hands of Éurito, king of Ecalia, but everything is a plot of an ambitious courtier. Hercules ends up falling in love with Deyanira, who is now a good queen.

The day of Chief Constable Saracino begins badly when his new car is stolen. Then, in his office, he meets Alfredo Fiori who believes that his wife and her lover, a veterinary, are trying to murder him.