After the son of a wealthy family is kidnapped by a group of ruthless criminals, a group of policeman and a Chinese waiter desperately try to solve the crime.

Duke Philippe marries Cristina, the daughter of a fisherman. But his brothers, seeing that they would be cut from the family inheritance set to go to Cristina, decide to get rid of her by imprisoning her in a tower and making the duke believe she died.

Don Giorgio, a handsome young priest and teacher in a convent, is involved with two lovers: Orchidea and Giulia. When he repents and vows to return to the Church, he is savagely beaten to death. Not long after, Giulia has her throat slashed. Inspector Boito falls in love with and prepared to marry Orchidea, who is also the main suspect. The key to solving the case seems to lie with an inquisitive boy called Ferruccio, who is kept locked up and drugged. He witnessed one of the murders, but will anyone believe his story?