Beautiful but Dangerous (Italian: La donna più bella del mondo, lit.

From the balcony, the prince of Russia, Sergio (Vittorio Gassman) comes down and makes the teaser group leave the theater and asks Lina to perform.

It was a very good performance, but at the end, she finds out that her mother had another attack, and has been sent to the long distance hospital.

The prince does not tell Lina his real identity but will say only that he came there for horse competition in the local club, and he stays regularly in Paris and he is from Russia.

With the dream she goes back to her music school in Rome and asks for the best teacher, she is ready to pay anything.

Lina owns the competition, and there a famous music director Silvani (Mario Del Monaco) meets her and invites her to the theater.

In a village side nearby Paris, Lina, Carmela stay together and Silvani comes to teach her extensive lesions on opera music.

Silvani, in Paris meets an opera whose music director was Doria, where they will arrange for Lina to sing.

Silvani dies, Lina thinks Sergio killed him, and Doria understands that she doesn't suspect him.

During the meeting with the Tsar and his wife, Lina sees Sergio, and she says that she wants to sing the new opera Tusca, the last performance with Silvani.

In the United States, the film was acquired by Howard Hughes for distribution by 20th Century Fox.

The film was due for release in Boston in early 1957 but was denied a Production Code seal until a love scene was cut.