This French-Italian romantic crime thriller is titled The Truth in English. Henri-Georges Clouzot directed sexpot Brigitte Bardot as Dominique Marceau, who is accused of killing her boyfriend. The question for the jury is whether the murder was premeditated or a crime of passion.
Marceau had come from a small town to take up a sexually adventuresome life on the Left Bank in Paris. She has an affair with Gilbert Tellier (Sami Frey), the boyfriend of her sister Annie (Marie-Jose Nat). Dominique moves on to other romances, but Tellier won't let go of her. They fight and eventually separate.
Tellier becomes a renowned orchestra conductor while Dominique descends into prostitution. She eventually learns that her sister and Tellier are engaged, and this knowledge leads up to the events that lead her to court.