La supertestimone: Tiziana's body

The river from which the car with Tiziana's body is fished out at the beginning of the film is the Aniene; the area is the one adjacent to the Ponte delle Valli in Rome, practically where Franco had his house.

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PLOT:
A woman who is troubled because unlucky in love becomes a ruthless accuser of a pimp suspected of murdering a prostitute, claiming to have seen him near the scene of the crime. After the defendant is convicted, however, she becomes convinced that she was wrong, obtains a review of the trial, and, falling in love, ends up marrying the pimp. The latter, who was guilty, pushed her into prostitution.