Tina, an old lady and detective stories buff, moves to town in the house of a god-daughter of hers whose husband is a private dick. She thinks she will be able to help him with his inquests. He does not agree with her and tries to discourage her by any possible means.

In the Venetian Republic a series of murders are carried out by a hooded man in black who always makes his escape through the city's waterways on a gondola.

Luisa Galli moves to Rome in search of a respectable job, but instead just finds a job as a waitress for the lawyer Giorgi.

Foreign spies steal the formula for a revolutionary explosive created by an Italian scientist and to decrypt the secret code they kidnap his secretary who knows about it.

A woman becomes convinced that her husband is an infamous wife-killer intent on adding her to his list of victims.

A courtesan sacrifices her relationship with a youthful admirer after the man's father pleads with her. Adapted from Giuseppe Verdi's 1853 opera in the three acts "La Traviata".

A disgraced member of the Spanish Navy must redeem his family's honor after his father betrays his country to the French.